diff --git a/bin/jss.js b/bin/jss.js
index ffd5a53a..48134651 100755
--- a/bin/jss.js
+++ b/bin/jss.js
@@ -773,11 +773,15 @@ accountCmd
 
       if (options.purge) {
         const dataRoot = process.env.DATA_ROOT || './data';
-        const podPath = path.join(dataRoot, account.username);
+        // Use podName, not username — createAccount lowercases the
+        // username but pod directories on disk preserve the original
+        // case. On case-sensitive filesystems they can differ.
+        const podPath = path.join(dataRoot, account.podName || account.username);
         await fs.remove(podPath);
         console.log(`\nDeleted account ${account.username}. Pod data removed from ${podPath}.\n`);
       } else {
-        console.log(`\nDeleted account ${account.username}. Pod data preserved at <dataRoot>/${account.username}/ (use --purge to remove).\n`);
+        const podDir = account.podName || account.username;
+        console.log(`\nDeleted account ${account.username}. Pod data preserved at <dataRoot>/${podDir}/ (use --purge to remove).\n`);
       }
     } catch (err) {
       console.error(`Error: ${err.message}`);
diff --git a/src/idp/credentials.js b/src/idp/credentials.js
index 3bf5950c..d09caa0c 100644
--- a/src/idp/credentials.js
+++ b/src/idp/credentials.js
@@ -5,7 +5,9 @@
 
 import * as jose from 'jose';
 import crypto from 'crypto';
-import { authenticate, findByWebId, updatePassword, verifyPassword } from './accounts.js';
+import fs from 'fs-extra';
+import path from 'path';
+import { authenticate, findByWebId, updatePassword, verifyPassword, deleteAccount } from './accounts.js';
 import { getJwks } from './keys.js';
 import { getWebIdFromRequestAsync } from '../auth/token.js';
 
@@ -272,6 +274,148 @@ export async function handleChangePassword(request, reply) {
   };
 }
 
+/**
+ * Handle DELETE /idp/account (#352)
+ *
+ * Owner-initiated account deletion. Authenticated caller proves
+ * possession via re-entering currentPassword (matches the
+ * password-rotation pattern in #351). Optional `purgeData: true` also
+ * removes the pod's filesystem tree at `<dataRoot>/<podName>/` (falling
+ * back to `<username>` only if podName is absent on the account record).
+ *
+ * Failure modes:
+ *   401 — unauthenticated, or wrong currentPassword
+ *   400 — invalid request body / missing password
+ *   403 — single-user mode (deletion would brick the server until
+ *         re-seed; operator should use the CLI), or no account for the
+ *         caller's WebID. The "no account" case lands here rather than
+ *         404 because the caller had a valid token — they're proving
+ *         identity, just not for an account this server holds.
+ *
+ * Out of scope: invalidating in-flight access tokens. Tokens reference
+ * the WebID; once the account record is gone, follow-up auth attempts
+ * fail at findByWebId(). Existing bearer tokens that don't round-trip
+ * through findByWebId() will appear valid until they expire — same
+ * shape as the password-change endpoint.
+ *
+ * @param {object} request - Fastify request
+ * @param {object} reply - Fastify reply
+ * @param {object} options
+ * @param {boolean} [options.singleUser] - When true, the endpoint
+ *   refuses (deletion would leave the server with no IDP account).
+ */
+export async function handleDeleteAccount(request, reply, options = {}) {
+  // Single-user mode: deletion via HTTP is blocked. The single-user
+  // pod has exactly one account; deleting it bricks the server until
+  // re-seed. The CLI (`jss account delete`) stays available for the
+  // operator who has filesystem access.
+  if (options.singleUser) {
+    return reply.code(403).send({
+      error: 'forbidden',
+      error_description: 'Account deletion via HTTP is disabled in single-user mode. Use the `jss account delete` CLI on the server.',
+    });
+  }
+
+  // 1. Authenticate caller
+  const { webId, error: authError } = await getWebIdFromRequestAsync(request);
+  if (!webId) {
+    return reply.code(401).send({
+      error: 'invalid_token',
+      error_description: authError || 'Authentication required',
+    });
+  }
+
+  // 2. Parse body — same flexible shape as handleChangePassword
+  let body = request.body;
+  if (Buffer.isBuffer(body)) body = body.toString('utf-8');
+  if (typeof body === 'string') {
+    try { body = JSON.parse(body); } catch { body = {}; }
+  }
+  const currentPassword = body?.currentPassword;
+  const purgeData = body?.purgeData === true;
+
+  if (typeof currentPassword !== 'string' || !currentPassword) {
+    return reply.code(400).send({
+      error: 'invalid_request',
+      error_description: 'currentPassword is required (string)',
+    });
+  }
+
+  // 3. Resolve account from caller's WebID
+  const account = await findByWebId(webId);
+  if (!account) {
+    return reply.code(403).send({
+      error: 'forbidden',
+      error_description: 'No account found for authenticated WebID',
+    });
+  }
+
+  // 4. Verify currentPassword (re-auth proof)
+  if (!(await verifyPassword(account, currentPassword))) {
+    return reply.code(401).send({
+      error: 'invalid_grant',
+      error_description: 'Current password is incorrect',
+    });
+  }
+
+  // 5. Delete the account record + indexes
+  await deleteAccount(account.id);
+
+  // 6. Optionally purge the pod's filesystem data. Mirrors the CLI
+  // `--purge` semantics. The path is `<dataRoot>/<podName>/`.
+  //
+  // Use account.podName, NOT account.username: createAccount normalizes
+  // username to lowercase (`username.toLowerCase().trim()`) but the pod
+  // directory on disk is created with the original case (per the input
+  // to handleCreatePod). On case-sensitive filesystems, deriving the
+  // purge path from username would either no-op (path doesn't exist)
+  // or hit a different directory if one exists at the lowercased name.
+  // Pod-name validation regex is /^[a-zA-Z0-9_-]+$/ (alphanum + dash +
+  // underscore; no dots, no traversal sequences) so podName is safe to
+  // join — defensive normalize stays as belt-and-suspenders.
+  //
+  // Best-effort: if fs.remove throws (permissions, transient FS error,
+  // race with another consumer), the account is already deleted and we
+  // shouldn't 500 over the leftover files. Log server-side and return
+  // purged: false so the caller knows pod data may still exist; an
+  // operator can finish the cleanup with a follow-up `rm -rf` or
+  // CLI `--purge` against the now-orphaned directory.
+  let purged = false;
+  if (purgeData) {
+    const dataRoot = process.env.DATA_ROOT || './data';
+    const candidate = path.resolve(dataRoot, account.podName || account.username);
+    const root = path.resolve(dataRoot);
+    // Belt-and-suspenders: refuse to remove anything that isn't a
+    // proper child of the data root. Won't trigger on registered pod
+    // names; protects against config drift / future bugs. Use
+    // path.relative so the check works when dataRoot is a filesystem
+    // root like `/` (where startsWith(root + path.sep) would compare
+    // against `//`, false-negative all valid children).
+    const rel = path.relative(root, candidate);
+    const isProperChild = rel && rel !== '' && !rel.startsWith('..') && !path.isAbsolute(rel);
+    if (isProperChild) {
+      try {
+        await fs.remove(candidate);
+        purged = true;
+      } catch (err) {
+        request.log.error({ err, path: candidate, username: account.username },
+          'Pod data purge failed after account deletion');
+        // Don't surface the raw error to the user (file paths,
+        // permission detail leak); response.purged signals the
+        // outcome.
+      }
+    }
+  }
+
+  reply.header('Cache-Control', 'no-store');
+  reply.header('Pragma', 'no-cache');
+  return {
+    ok: true,
+    webid: account.webId,
+    purged,
+  };
+}
+
 /**
  * Handle GET /idp/credentials
  * Returns info about the credentials endpoint
diff --git a/src/idp/index.js b/src/idp/index.js
index c963609c..740e864f 100644
--- a/src/idp/index.js
+++ b/src/idp/index.js
@@ -23,6 +23,7 @@ import {
   handleCredentials,
   handleCredentialsInfo,
   handleChangePassword,
+  handleDeleteAccount,
 } from './credentials.js';
 import * as passkey from './passkey.js';
 import { addTrustedIssuer } from '../auth/solid-oidc.js';
@@ -279,6 +280,21 @@ export async function idpPlugin(fastify, options) {
     return handleChangePassword(request, reply);
   });
 
+  // DELETE account - authenticated owner deletes their own account (#352).
+  // Single-user mode is rejected at the handler (deletion would leave the
+  // server with no IDP account until re-seed; CLI is the operator path).
+  fastify.delete('/idp/account', {
+    config: {
+      rateLimit: {
+        max: 5,
+        timeWindow: '1 minute',
+        keyGenerator: (request) => request.ip
+      }
+    }
+  }, async (request, reply) => {
+    return handleDeleteAccount(request, reply, { singleUser });
+  });
+
   // Interaction routes (our custom login/consent UI)
   // These bypass oidc-provider and use our handlers
 
diff --git a/test/idp-delete-account.test.js b/test/idp-delete-account.test.js
new file mode 100644
index 00000000..f8652bd0
--- /dev/null
+++ b/test/idp-delete-account.test.js
@@ -0,0 +1,334 @@
+/**
+ * DELETE /idp/account — authenticated owner deletes their own account (#352)
+ */
+
+import { describe, it, before, after } from 'node:test';
+import assert from 'node:assert';
+import { createServer } from '../src/server.js';
+import fs from 'fs-extra';
+import path from 'path';
+import { createServer as createNetServer } from 'net';
+
+const TEST_HOST = 'localhost';
+
+function getAvailablePort() {
+  return new Promise((resolve, reject) => {
+    const srv = createNetServer();
+    srv.on('error', reject);
+    srv.listen(0, TEST_HOST, () => {
+      const port = srv.address().port;
+      srv.close(() => resolve(port));
+    });
+  });
+}
+
+async function createPod(baseUrl, name, email, password) {
+  const res = await fetch(`${baseUrl}/.pods`, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify({ name, email, password }),
+  });
+  const body = await res.json().catch(() => ({}));
+  assert.strictEqual(res.status, 201, `pod create failed: ${JSON.stringify(body)}`);
+  return body;
+}
+
+async function loginToken(baseUrl, email, password) {
+  const res = await fetch(`${baseUrl}/idp/credentials`, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify({ email, password }),
+  });
+  const body = await res.json().catch(() => ({}));
+  assert.strictEqual(res.status, 200, `login failed: ${JSON.stringify(body)}`);
+  return body.access_token;
+}
+
+describe('DELETE /idp/account — self-delete', () => {
+  let server;
+  let baseUrl;
+  let originalDataRoot;
+  const DATA_DIR = './test-data-delete-account';
+
+  before(async () => {
+    originalDataRoot = process.env.DATA_ROOT;
+    await fs.remove(DATA_DIR);
+    await fs.ensureDir(DATA_DIR);
+    const port = await getAvailablePort();
+    baseUrl = `http://${TEST_HOST}:${port}`;
+    server = createServer({
+      logger: false,
+      root: DATA_DIR,
+      idp: true,
+      idpIssuer: baseUrl,
+      forceCloseConnections: true,
+    });
+    await server.listen({ port, host: TEST_HOST });
+  });
+
+  after(async () => {
+    await server.close();
+    await fs.remove(DATA_DIR);
+    if (originalDataRoot === undefined) delete process.env.DATA_ROOT;
+    else process.env.DATA_ROOT = originalDataRoot;
+  });
+
+  it('rejects unauthenticated request with 401', async () => {
+    const res = await fetch(`${baseUrl}/idp/account`, {
+      method: 'DELETE',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ currentPassword: 'whatever' }),
+    });
+    assert.strictEqual(res.status, 401);
+  });
+
+  it('rejects missing currentPassword with 400', async () => {
+    const id = `alice${Date.now()}`;
+    await createPod(baseUrl, id, `${id}@example.com`, 'password123');
+    const token = await loginToken(baseUrl, `${id}@example.com`, 'password123');
+
+    const res = await fetch(`${baseUrl}/idp/account`, {
+      method: 'DELETE',
+      headers: {
+        'Content-Type': 'application/json',
+        'Authorization': `Bearer ${token}`,
+      },
+      body: JSON.stringify({}),
+    });
+    assert.strictEqual(res.status, 400);
+  });
+
+  it('rejects wrong currentPassword with 401, account untouched', async () => {
+    const id = `bob${Date.now()}`;
+    await createPod(baseUrl, id, `${id}@example.com`, 'password123');
+    const token = await loginToken(baseUrl, `${id}@example.com`, 'password123');
+
+    const res = await fetch(`${baseUrl}/idp/account`, {
+      method: 'DELETE',
+      headers: {
+        'Content-Type': 'application/json',
+        'Authorization': `Bearer ${token}`,
+      },
+      body: JSON.stringify({ currentPassword: 'wrongpassword' }),
+    });
+    assert.strictEqual(res.status, 401);
+
+    // Account still works
+    const reLogin = await fetch(`${baseUrl}/idp/credentials`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ email: `${id}@example.com`, password: 'password123' }),
+    });
+    assert.strictEqual(reLogin.status, 200);
+  });
+
+  it('happy path: deletes account; subsequent login fails with 401', async () => {
+    const id = `carol${Date.now()}`;
+    await createPod(baseUrl, id, `${id}@example.com`, 'password123');
+    const token = await loginToken(baseUrl, `${id}@example.com`, 'password123');
+
+    const res = await fetch(`${baseUrl}/idp/account`, {
+      method: 'DELETE',
+      headers: {
+        'Content-Type': 'application/json',
+        'Authorization': `Bearer ${token}`,
+      },
+      body: JSON.stringify({ currentPassword: 'password123' }),
+    });
+    assert.strictEqual(res.status, 200);
+    const body = await res.json();
+    assert.strictEqual(body.ok, true);
+    assert.ok(body.webid.includes(id), 'response carries webid');
+    assert.strictEqual(body.purged, false, 'purgeData defaults to false');
+
+    // Login as the same user now fails
+    const reLogin = await fetch(`${baseUrl}/idp/credentials`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ email: `${id}@example.com`, password: 'password123' }),
+    });
+    assert.strictEqual(reLogin.status, 401);
+  });
+
+  it('purgeData: true also wipes the pod filesystem tree', async () => {
+    const id = `dave${Date.now()}`;
+    await createPod(baseUrl, id, `${id}@example.com`, 'password123');
+    const token = await loginToken(baseUrl, `${id}@example.com`, 'password123');
+
+    // Pod tree exists before deletion
+    const podPath = path.join(DATA_DIR, id);
+    assert.strictEqual(await fs.pathExists(podPath), true,
+      'pod data should exist before deletion');
+
+    const res = await fetch(`${baseUrl}/idp/account`, {
+      method: 'DELETE',
+      headers: {
+        'Content-Type': 'application/json',
+        'Authorization': `Bearer ${token}`,
+      },
+      body: JSON.stringify({ currentPassword: 'password123', purgeData: true }),
+    });
+    assert.strictEqual(res.status, 200);
+    const body = await res.json();
+    assert.strictEqual(body.purged, true);
+
+    // Pod tree gone
+    assert.strictEqual(await fs.pathExists(podPath), false,
+      'pod data should be purged');
+  });
+
+  it('purgeData: true removes the on-disk pod dir even when it has uppercase letters', async () => {
+    // Regression for the bug where purge derived its path from
+    // account.username (which createAccount lowercases) instead of
+    // account.podName (which preserves the original case). On
+    // case-sensitive filesystems the pod dir at <dataRoot>/Greta…/
+    // wouldn't match the derived <dataRoot>/greta…/ path.
+    const id = `Greta${Date.now()}`;
+    await createPod(baseUrl, id, `${id.toLowerCase()}@example.com`, 'password123');
+    const token = await loginToken(baseUrl, `${id.toLowerCase()}@example.com`, 'password123');
+
+    const podPath = path.join(DATA_DIR, id); // mixed-case as created
+    assert.strictEqual(await fs.pathExists(podPath), true,
+      'pod data should exist at the mixed-case path before deletion');
+
+    const res = await fetch(`${baseUrl}/idp/account`, {
+      method: 'DELETE',
+      headers: {
+        'Content-Type': 'application/json',
+        'Authorization': `Bearer ${token}`,
+      },
+      body: JSON.stringify({ currentPassword: 'password123', purgeData: true }),
+    });
+    assert.strictEqual(res.status, 200);
+    const body = await res.json();
+    assert.strictEqual(body.purged, true, 'purge should report success');
+
+    assert.strictEqual(await fs.pathExists(podPath), false,
+      'mixed-case pod dir should be gone (regression: not stranded by username lowercasing)');
+  });
+
+  it('purgeData: false (default) preserves the pod filesystem tree', async () => {
+    const id = `frank${Date.now()}`;
+    await createPod(baseUrl, id, `${id}@example.com`, 'password123');
+    const token = await loginToken(baseUrl, `${id}@example.com`, 'password123');
+
+    const podPath = path.join(DATA_DIR, id);
+    assert.strictEqual(await fs.pathExists(podPath), true);
+
+    const res = await fetch(`${baseUrl}/idp/account`, {
+      method: 'DELETE',
+      headers: {
+        'Content-Type': 'application/json',
+        'Authorization': `Bearer ${token}`,
+      },
+      // Note: no purgeData flag at all
+      body: JSON.stringify({ currentPassword: 'password123' }),
+    });
+    assert.strictEqual(res.status, 200);
+
+    // Account is gone but pod data preserved
+    assert.strictEqual(await fs.pathExists(podPath), true,
+      'pod data should be preserved when purgeData is omitted');
+  });
+
+  it('cross-account: A authenticated, sending B\'s password — fails 401, neither account touched', async () => {
+    const aId = `eve${Date.now()}`;
+    const bId = `mallory${Date.now() + 1}`;
+    await createPod(baseUrl, aId, `${aId}@example.com`, 'apassword123');
+    await createPod(baseUrl, bId, `${bId}@example.com`, 'bpassword123');
+
+    const aToken = await loginToken(baseUrl, `${aId}@example.com`, 'apassword123');
+
+    // A sends B's password — handler resolves account from A's WebID, so the
+    // currentPassword must match A's. With B's password it fails 401 (and
+    // crucially doesn't touch either account).
+    const res = await fetch(`${baseUrl}/idp/account`, {
+      method: 'DELETE',
+      headers: {
+        'Content-Type': 'application/json',
+        'Authorization': `Bearer ${aToken}`,
+      },
+      body: JSON.stringify({ currentPassword: 'bpassword123' }),
+    });
+    assert.strictEqual(res.status, 401);
+
+    // Both accounts still functional
+    const aLogin = await fetch(`${baseUrl}/idp/credentials`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ email: `${aId}@example.com`, password: 'apassword123' }),
+    });
+    assert.strictEqual(aLogin.status, 200);
+
+    const bLogin = await fetch(`${baseUrl}/idp/credentials`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ email: `${bId}@example.com`, password: 'bpassword123' }),
+    });
+    assert.strictEqual(bLogin.status, 200);
+  });
+});
+
+describe('DELETE /idp/account — single-user mode', () => {
+  let server;
+  let baseUrl;
+  let originalDataRoot;
+  let originalPassword;
+  const DATA_DIR = './test-data-delete-account-single';
+
+  before(async () => {
+    originalDataRoot = process.env.DATA_ROOT;
+    originalPassword = process.env.JSS_SINGLE_USER_PASSWORD;
+    process.env.JSS_SINGLE_USER_PASSWORD = 'singletest';
+    await fs.remove(DATA_DIR);
+    await fs.ensureDir(DATA_DIR);
+    const port = await getAvailablePort();
+    baseUrl = `http://${TEST_HOST}:${port}`;
+    server = createServer({
+      logger: false,
+      root: DATA_DIR,
+      idp: true,
+      idpIssuer: baseUrl,
+      singleUser: true,
+      singleUserName: 'me',
+      singleUserPassword: 'singletest',
+      forceCloseConnections: true,
+    });
+    await server.listen({ port, host: TEST_HOST });
+  });
+
+  after(async () => {
+    await server.close();
+    await fs.remove(DATA_DIR);
+    if (originalDataRoot === undefined) delete process.env.DATA_ROOT;
+    else process.env.DATA_ROOT = originalDataRoot;
+    if (originalPassword === undefined) delete process.env.JSS_SINGLE_USER_PASSWORD;
+    else process.env.JSS_SINGLE_USER_PASSWORD = originalPassword;
+  });
+
+  it('returns 403 in single-user mode (deletion would brick the server)', async () => {
+    // Even with a valid token, the endpoint refuses in single-user mode.
+    // Operator must use the CLI (`jss account delete`) instead.
+    const token = await loginToken(baseUrl, 'me', 'singletest');
+
+    const res = await fetch(`${baseUrl}/idp/account`, {
+      method: 'DELETE',
+      headers: {
+        'Content-Type': 'application/json',
+        'Authorization': `Bearer ${token}`,
+      },
+      body: JSON.stringify({ currentPassword: 'singletest' }),
+    });
+    assert.strictEqual(res.status, 403);
+    const body = await res.json();
+    assert.match(body.error_description || '', /single-user/i);
+
+    // Account still functional
+    const reLogin = await fetch(`${baseUrl}/idp/credentials`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ email: 'me', password: 'singletest' }),
+    });
+    assert.strictEqual(reLogin.status, 200);
+  });
+});