diff --git a/.pipelines/templates/mac-package-build.yml b/.pipelines/templates/mac-package-build.yml
index 6585773c743..154cb6c0257 100644
--- a/.pipelines/templates/mac-package-build.yml
+++ b/.pipelines/templates/mac-package-build.yml
@@ -76,6 +76,14 @@ jobs:
     # Diagnostics is not critical it passes every time it runs
     continueOnError: true
 
+  - pwsh: |
+      $signedDir = "$(Pipeline.Workspace)/CoOrdinatedBuildPipeline/drop_macos_sign_${{ parameters.buildArchitecture }}/Signed-${{ parameters.buildArchitecture }}"
+      Get-ChildItem $signedDir -Recurse -Include 'pwsh', '*.dylib' | ForEach-Object {
+        codesign --verify --deep --strict --verbose=4 $_.FullName
+        if ($LASTEXITCODE -ne 0) { throw "codesign verification failed for $($_.FullName)" }
+      }
+    displayName: 'Verify Apple codesign on signed binaries'
+
   - pwsh: |
       # Add -SkipReleaseChecks as a mitigation to unblock release.
       # macos-10.15 does not allow creating a folder under root. Hence, moving the folder.
@@ -158,7 +166,12 @@ jobs:
         Write-Host "##vso[artifact.upload containerfolder=macos-pkgs;artifactname=macos-pkgs]$file"
       }
 
+      $packageInfo = Get-MacOSPackageIdentifierInfo -Version '$(Version)' -LTS:$LTS
+      Write-Verbose -Verbose "BundleId: $($packageInfo.PackageIdentifier)"
+      Write-Host "##vso[task.setvariable variable=BundleId;isOutput=true]$($packageInfo.PackageIdentifier)"
+
     displayName: 'Package ${{ parameters.buildArchitecture}}'
+    name: packageStep
     env:
       __DOTNET_RUNTIME_FEED_KEY: $(RUNTIME_SOURCEFEED_KEY)
 
@@ -178,7 +191,8 @@ jobs:
     value: $(Build.SourcesDirectory)/PowerShell/.config/suppress.json
   - name: BuildArch
     value: ${{ parameters.buildArchitecture }}
-  - group: mscodehub-macos-package-signing
+  - name: BundleId
+    value: $[ dependencies.package_macOS_${{ parameters.buildArchitecture }}.outputs['packageStep.BundleId'] ]
 
   steps:
   - download: current
@@ -216,32 +230,59 @@ jobs:
       inline_operation: |
         [
           {
-            "KeyCode": "$(KeyCode)",
+            "KeyCode": "CP-401337-Apple",
             "OperationCode": "MacAppDeveloperSign",
             "ToolName": "sign",
             "ToolVersion": "1.0",
             "Parameters": {
-              "Hardening": "Enable",
-              "OpusInfo": "http://microsoft.com"
+              "Hardening": "--options=runtime"
             }
           }
         ]
 
+  - task: onebranch.pipeline.signing@1
+    displayName: 'OneBranch Notarize Package'
+    inputs:
+      command: 'sign'
+      files_to_sign: '**/*-osx-*.zip'
+      search_root: '$(Pipeline.Workspace)'
+      inline_operation: |
+        [
+          {
+            "KeyCode": "CP-401337-Apple",
+            "OperationCode": "MacAppNotarize",
+            "ToolName": "sign",
+            "ToolVersion": "1.0",
+            "Parameters": {
+              "BundleId": "$(BundleId)"
+            }
+          }
+        ]
+    timeoutInMinutes: 120
+
   - pwsh: |
       $signedPkg = Get-ChildItem -Path $(Pipeline.Workspace) -Filter "*osx*.zip" -File
 
+      if (-not (Test-Path $(ob_outputDirectory))) {
+        $null = New-Item -Path $(ob_outputDirectory) -ItemType Directory
+      }
+
+      $expandDir = "$(Pipeline.Workspace)/pkgExpand"
+      $null = New-Item -Path $expandDir -ItemType Directory -Force
+
       $signedPkg | ForEach-Object {
         Write-Verbose -Verbose "Signed package zip: $_"
+        Expand-Archive -Path $_ -DestinationPath $expandDir -Verbose
+      }
 
-        if (-not (Test-Path $_)) {
-          throw "Package not found: $_"
-        }
-
-        if (-not (Test-Path $(ob_outputDirectory))) {
-          $null = New-Item -Path $(ob_outputDirectory) -ItemType Directory
-        }
+      # ESRP's signing pipeline nests the PKG inside a '<hash>.zip.unzipped' subfolder
+      $pkgFile = Get-ChildItem -Path $expandDir -Filter '*.pkg' -Recurse -File
+      if (-not $pkgFile) {
+        throw "Package not found in: $signedPkg"
+      }
 
-        Expand-Archive -Path $_ -DestinationPath $(ob_outputDirectory) -Verbose
+      $pkgFile | ForEach-Object {
+        Move-Item -Path $_ -Destination $(ob_outputDirectory) -Verbose
       }
 
       Write-Verbose -Verbose "Expanded pkg file:"
diff --git a/.pipelines/templates/mac.yml b/.pipelines/templates/mac.yml
index 1699207c657..b22149d5e46 100644
--- a/.pipelines/templates/mac.yml
+++ b/.pipelines/templates/mac.yml
@@ -69,6 +69,14 @@ jobs:
       $psOptPath = "$(OB_OUTPUTDIRECTORY)/psoptions.json"
       Save-PSOptions -PSOptionsPath $psOptPath
 
+      $entitlements = "$(PowerShellRoot)/assets/macos-entitlements.plist"
+      $pwshBin = "$(OB_OUTPUTDIRECTORY)/pwsh"
+      Write-Verbose -Verbose "Applying entitlements to $pwshBin"
+      codesign --sign - --force --options runtime --entitlements $entitlements $pwshBin
+      if ($LASTEXITCODE -ne 0) {
+        throw "codesign failed with exit code $LASTEXITCODE"
+      }
+
       # Since we are using custom pool for macOS, we need to use artifact.upload to publish the artifacts
       Write-Host "##vso[artifact.upload containerfolder=$artifactName;artifactname=$artifactName]$(OB_OUTPUTDIRECTORY)"
 
@@ -144,4 +152,36 @@ jobs:
       binPath: $(DropRootPath)
       OfficialBuild: $(ps_official_build)
 
+  # Apple-sign the Mach-O binaries inside the signed output.
+  - pwsh: |
+      $signedDir = "$(ob_outputDirectory)/Signed-$(Runtime)"
+      $zipFile = "$(Pipeline.Workspace)/macho-$(BuildArchitecture).zip"
+      Compress-Archive -Path "$signedDir/*" -DestinationPath $zipFile -Force
+    displayName: Compress signed folder for Apple signing
+
+  - task: onebranch.pipeline.signing@1
+    displayName: Apple CodeSign Mach-O binaries
+    inputs:
+      command: 'sign'
+      files_to_sign: 'macho-$(BuildArchitecture).zip'
+      search_root: '$(Pipeline.Workspace)'
+      inline_operation: |
+        [
+          {
+            "KeyCode": "CP-401337-Apple",
+            "OperationCode": "MacAppDeveloperSign",
+            "ToolName": "sign",
+            "ToolVersion": "1.0",
+            "Parameters": {
+              "Hardening": "--options=runtime"
+            }
+          }
+        ]
+
+  - pwsh: |
+      $signedDir = "$(ob_outputDirectory)/Signed-$(Runtime)"
+      $zipFile = "$(Pipeline.Workspace)/macho-$(BuildArchitecture).zip"
+      Expand-Archive -Path $zipFile -DestinationPath $signedDir -Force -Verbose
+    displayName: Expand Apple-signed Mach-O binaries into signed output
+
   - template: /.pipelines/templates/step/finalize.yml@self
diff --git a/assets/macos-entitlements.plist b/assets/macos-entitlements.plist
new file mode 100644
index 00000000000..9d534f4f4bf
--- /dev/null
+++ b/assets/macos-entitlements.plist
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <key>com.apple.security.cs.allow-jit</key>
+    <true/>
+    <key>com.apple.security.cs.allow-unsigned-executable-memory</key>
+    <true/>
+    <key>com.apple.security.cs.allow-dyld-environment-variables</key>
+    <true/>
+    <key>com.apple.security.cs.disable-library-validation</key>
+    <true/>
+</dict>
+</plist>
diff --git a/tools/packaging/packaging.psd1 b/tools/packaging/packaging.psd1
index 0053428a481..e5b7fb84dfc 100644
--- a/tools/packaging/packaging.psd1
+++ b/tools/packaging/packaging.psd1
@@ -26,6 +26,7 @@
         'Test-PackageManifest'
         'Update-PSSignedBuildFolder'
         'Test-Bom'
+        'Get-MacOSPackageIdentifierInfo'
     )
     RootModule        = "packaging.psm1"
     RequiredModules   = @("build")