diff --git a/src/ExcelDataReader.Tests/ExcelBinaryReaderTest.cs b/src/ExcelDataReader.Tests/ExcelBinaryReaderTest.cs
index ca2e345b..1531b60d 100644
--- a/src/ExcelDataReader.Tests/ExcelBinaryReaderTest.cs
+++ b/src/ExcelDataReader.Tests/ExcelBinaryReaderTest.cs
@@ -110,7 +110,7 @@ public void TestOpenOffice()
     }
 
     /// <summary>
-    /// Issue 11 - OpenOffice files were skipping the first row if IsFirstRowAsColumnNames = false;
+    /// Issue 11 - OpenOffice files were skipping the first row if IsFirstRowAsColumnNames = false.
     /// </summary>
     [Test]
     public void GitIssue11OpenOfficeRowCount()
@@ -170,7 +170,7 @@ public void Issue11572CodePage()
     }
 
     /// <summary>
-    /// Not fixed yet
+    /// Not fixed yet.
     /// </summary>
     [Test]
     public void Issue11545NoIndex()
@@ -211,7 +211,7 @@ public void Issue11636BiffStream()
     /// Not fixed yet
     /// The problem occurs with unseekable stream and logic related to minifat that uses seek
     /// It should probably only use seek if it needs to go backwards, I think at the moment it uses seek all the time
-    /// which is probably not good for performance
+    /// which is probably not good for performance.
     /// </summary>
     [Test]
     [Ignore("Not fixed yet")]
@@ -228,7 +228,7 @@ public void Issue1163911644ForwardOnlyStream()
     /// Not fixed yet
     /// The problem occurs with unseekable stream and logic related to minifat that uses seek
     /// It should probably only use seek if it needs to go backwards, I think at the moment it uses seek all the time
-    /// which is probably not good for performance
+    /// which is probably not good for performance.
     /// </summary>
     [Test]
     public void Issue12556Corrupt()
@@ -243,7 +243,7 @@ public void Issue12556Corrupt()
     }
 
     /// <summary>
-    /// Some spreadsheets were crashing with index out of range error (from SSRS)
+    /// Some spreadsheets were crashing with index out of range error (from SSRS).
     /// </summary>
     [Test]
     public void TestIssue11818OutOfRange()
@@ -1069,6 +1069,30 @@ public void GitIssue578()
         Assert.That(values3, Is.EqualTo(new object[] { 1, 2, 3, 4 }));
     }
 
+    [Test]
+    public void GitIssue642_ActiveSheet()
+    {
+        using var reader = OpenReader("Test_git_issue_642");
+        var dataSet = reader.AsDataSet(new ExcelDataSetConfiguration()
+        {
+            FilterSheet = (tableReader, sheetIndex) => tableReader.IsActiveSheet
+        });
+        Assert.That(reader.ActiveSheet, Is.EqualTo(5));
+        Assert.That(dataSet.Tables[0].TableName, Is.EqualTo("List6"));
+    }
+
+    [Test]
+    public void GitIssue642_ActiveSheet_SingleWorksheet()
+    {
+        using var reader = OpenReader("Test_git_issue_642onesheet");
+        var dataSet = reader.AsDataSet(new ExcelDataSetConfiguration()
+        {
+            FilterSheet = (tableReader, sheetIndex) => tableReader.IsActiveSheet
+        });
+        Assert.That(reader.ActiveSheet, Is.EqualTo(0));
+        Assert.That(dataSet.Tables[0].TableName, Is.EqualTo("List1"));
+    }
+
     protected override IExcelDataReader OpenReader(Stream stream, ExcelReaderConfiguration configuration = null)
     {
         return ExcelReaderFactory.CreateBinaryReader(stream, configuration);
diff --git a/src/ExcelDataReader.Tests/ExcelCsvReaderTest.cs b/src/ExcelDataReader.Tests/ExcelCsvReaderTest.cs
index e9a52c00..b8e0b10b 100644
--- a/src/ExcelDataReader.Tests/ExcelCsvReaderTest.cs
+++ b/src/ExcelDataReader.Tests/ExcelCsvReaderTest.cs
@@ -3,7 +3,7 @@
 namespace ExcelDataReader.Tests;
 
 /// <summary>
-/// Most CSV test data came from csv-spectrum: https://github.com/maxogden/csv-spectrum 
+/// Most CSV test data came from csv-spectrum: https://github.com/maxogden/csv-spectrum. 
 /// </summary>
 public class ExcelCsvReaderTest
 {
@@ -467,4 +467,16 @@ public void GitIssue463()
             Assert.That(row4, Is.EqualTo(new object[] { "Test3", "IJK", "ZZ", "10,143.27", "0.00" }));
         });
     }
+
+    [Test]
+    public void GitIssue642_ActiveSheet()
+    {
+        using var reader = ExcelReaderFactory.CreateCsvReader(Configuration.GetTestWorkbook("csv\\MOCK_DATA.csv"));
+        var dataSet = reader.AsDataSet(new ExcelDataSetConfiguration()
+        {
+            FilterSheet = (tableReader, sheetIndex) => tableReader.IsActiveSheet
+        });
+        Assert.That(reader.ActiveSheet, Is.EqualTo(0));
+        Assert.That(dataSet.Tables.Count, Is.EqualTo(1));
+    }
 }
diff --git a/src/ExcelDataReader.Tests/ExcelOpenXmlBinaryReaderTest.cs b/src/ExcelDataReader.Tests/ExcelOpenXmlBinaryReaderTest.cs
index bbe3bb24..06e15562 100644
--- a/src/ExcelDataReader.Tests/ExcelOpenXmlBinaryReaderTest.cs
+++ b/src/ExcelDataReader.Tests/ExcelOpenXmlBinaryReaderTest.cs
@@ -14,6 +14,30 @@ public void GitIssue635()
         Assert.That(dataSet.Tables[0].Rows[0].ItemArray, Is.EqualTo(new[] { "A", "B", "C", "D", "E", "F" }));
     }
 
+    [Test]
+    public void GitIssue642_ActiveSheet()
+    {
+        using var reader = OpenReader("Test_git_issue_642");
+        var dataSet = reader.AsDataSet(new ExcelDataSetConfiguration()
+        {
+            FilterSheet = (tableReader, sheetIndex) => tableReader.IsActiveSheet
+        });
+        Assert.That(reader.ActiveSheet, Is.EqualTo(5));
+        Assert.That(dataSet.Tables[0].TableName, Is.EqualTo("List6"));
+    }
+
+    [Test]
+    public void GitIssue642_ActiveSheet_SingleWorksheet()
+    {
+        using var reader = OpenReader("Test_git_issue_642onesheet");
+        var dataSet = reader.AsDataSet(new ExcelDataSetConfiguration()
+        {
+            FilterSheet = (tableReader, sheetIndex) => tableReader.IsActiveSheet
+        });
+        Assert.That(reader.ActiveSheet, Is.EqualTo(0));
+        Assert.That(dataSet.Tables[0].TableName, Is.EqualTo("List1"));
+    }
+
     /// <inheritdoc />
     protected override Stream OpenStream(string name)
     {
diff --git a/src/ExcelDataReader.Tests/ExcelOpenXmlReaderTest.cs b/src/ExcelDataReader.Tests/ExcelOpenXmlReaderTest.cs
index 99f37384..93ee0df9 100644
--- a/src/ExcelDataReader.Tests/ExcelOpenXmlReaderTest.cs
+++ b/src/ExcelDataReader.Tests/ExcelOpenXmlReaderTest.cs
@@ -458,6 +458,30 @@ public void GitIssue518MultipleHeaderRows()
         }
     }
 
+    [Test]
+    public void GitIssue642_ActiveSheet()
+    {
+        using var reader = OpenReader("Test_git_issue_642");
+        var dataSet = reader.AsDataSet(new ExcelDataSetConfiguration()
+        {
+            FilterSheet = (tableReader, sheetIndex) => tableReader.IsActiveSheet
+        });
+        Assert.That(reader.ActiveSheet, Is.EqualTo(5));
+        Assert.That(dataSet.Tables[0].TableName, Is.EqualTo("List6"));
+    }
+
+    [Test]
+    public void GitIssue642_ActiveSheet_SingleWorksheet()
+    {
+        using var reader = OpenReader("Test_git_issue_642onesheet");
+        var dataSet = reader.AsDataSet(new ExcelDataSetConfiguration()
+        {
+            FilterSheet = (tableReader, sheetIndex) => tableReader.IsActiveSheet
+        });
+        Assert.That(reader.ActiveSheet, Is.EqualTo(0));
+        Assert.That(dataSet.Tables[0].TableName, Is.EqualTo("List1"));
+    }
+
     protected override IExcelDataReader OpenReader(Stream stream, ExcelReaderConfiguration configuration = null) 
     => ExcelReaderFactory.CreateOpenXmlReader(stream, configuration);
 
diff --git a/src/ExcelDataReader.Tests/ExcelTestBase.cs b/src/ExcelDataReader.Tests/ExcelTestBase.cs
index 30671310..0a12df18 100644
--- a/src/ExcelDataReader.Tests/ExcelTestBase.cs
+++ b/src/ExcelDataReader.Tests/ExcelTestBase.cs
@@ -49,7 +49,7 @@ public void Issue11773ExponentialCommas()
     }
 
     /// <summary>
-    /// Makes sure that we can read data from the first row of last sheet
+    /// Makes sure that we can read data from the first row of last sheet.
     /// </summary>
     [Test]
     public void Issue12271NextResultSet()
diff --git a/src/ExcelDataReader/Core/BinaryFormat/XlsWorkbook.cs b/src/ExcelDataReader/Core/BinaryFormat/XlsWorkbook.cs
index 9fb5b70d..8e578bdc 100644
--- a/src/ExcelDataReader/Core/BinaryFormat/XlsWorkbook.cs
+++ b/src/ExcelDataReader/Core/BinaryFormat/XlsWorkbook.cs
@@ -77,6 +77,8 @@ internal XlsWorkbook(Stream stream, string password, Encoding fallbackEncoding)
 
     public int ResultsCount => Sheets?.Count ?? -1;
 
+    public int ActiveSheet { get; private set; }
+
     public static bool IsRawBiffStream(byte[] bytes)
     {
         if (bytes.Length < 8)
@@ -203,6 +205,10 @@ private void ReadWorkbookGlobals(XlsBiffStream biffStream)
                     ExtSST = rec;
                     break;
 
+                case XlsBiffRecord _ when rec.Id == BIFFRECORDTYPE.WINDOW1:
+                    ActiveSheet = rec.ReadInt16(10);
+                    break;
+
                 // case BIFFRECORDTYPE.PROTECT:
                 // case BIFFRECORDTYPE.PROT4REVPASSWORD:
                     // IsProtected
diff --git a/src/ExcelDataReader/Core/BinaryFormat/XlsWorksheet.cs b/src/ExcelDataReader/Core/BinaryFormat/XlsWorksheet.cs
index 38fe95bc..c3239d2f 100644
--- a/src/ExcelDataReader/Core/BinaryFormat/XlsWorksheet.cs
+++ b/src/ExcelDataReader/Core/BinaryFormat/XlsWorksheet.cs
@@ -42,6 +42,11 @@ public XlsWorksheet(XlsWorkbook workbook, XlsBiffBoundSheet refSheet, Stream str
     /// </summary>
     public string VisibleState { get; }
 
+    /// <summary>
+    /// Gets a value indicating whether the sheet is active.
+    /// </summary>       
+    public bool IsActiveSheet { get; }
+
     public HeaderFooter HeaderFooter { get; private set; }
 
     public CellRange[] MergeCells { get; private set; }
diff --git a/src/ExcelDataReader/Core/CsvFormat/CsvWorkbook.cs b/src/ExcelDataReader/Core/CsvFormat/CsvWorkbook.cs
index aeb24a95..f1af684d 100644
--- a/src/ExcelDataReader/Core/CsvFormat/CsvWorkbook.cs
+++ b/src/ExcelDataReader/Core/CsvFormat/CsvWorkbook.cs
@@ -7,6 +7,8 @@ internal sealed class CsvWorkbook(Stream stream, Encoding encoding, char[] autod
 {
     public int ResultsCount => 1;
 
+    public int ActiveSheet => 0;
+
     public Stream Stream { get; } = stream;
 
     public Encoding Encoding { get; } = encoding;
diff --git a/src/ExcelDataReader/Core/CsvFormat/CsvWorksheet.cs b/src/ExcelDataReader/Core/CsvFormat/CsvWorksheet.cs
index a73be669..65141453 100644
--- a/src/ExcelDataReader/Core/CsvFormat/CsvWorksheet.cs
+++ b/src/ExcelDataReader/Core/CsvFormat/CsvWorksheet.cs
@@ -34,6 +34,10 @@ public CsvWorksheet(Stream stream, Encoding fallbackEncoding, char[] autodetectS
         }
     }
 
+    public static int ActiveSheet => 0;
+
+    public static bool IsActiveSheet => true;
+
     public string Name => string.Empty;
 
     public string CodeName => null;
diff --git a/src/ExcelDataReader/Core/IWorkbook.cs b/src/ExcelDataReader/Core/IWorkbook.cs
index 251a213d..1ed4f34b 100644
--- a/src/ExcelDataReader/Core/IWorkbook.cs
+++ b/src/ExcelDataReader/Core/IWorkbook.cs
@@ -11,6 +11,8 @@ internal interface IWorkbook<TWorksheet>
 {
     int ResultsCount { get; }
 
+    int ActiveSheet { get; }
+
     IEnumerable<TWorksheet> ReadWorksheets();
 
     NumberFormatString GetNumberFormatString(int index);
diff --git a/src/ExcelDataReader/Core/OpenXmlFormat/BinaryFormat/BiffWorkbookReader.cs b/src/ExcelDataReader/Core/OpenXmlFormat/BinaryFormat/BiffWorkbookReader.cs
index eea1153d..857f82a1 100644
--- a/src/ExcelDataReader/Core/OpenXmlFormat/BinaryFormat/BiffWorkbookReader.cs
+++ b/src/ExcelDataReader/Core/OpenXmlFormat/BinaryFormat/BiffWorkbookReader.cs
@@ -8,7 +8,8 @@ internal sealed class BiffWorkbookReader(Stream stream, Dictionary<string, strin
 {
     private const int WorkbookPr = 0x99;
     private const int Sheet = 0x9C;
-    
+    private const int BrtBookView = 0x9e;
+
     private readonly Dictionary<string, string> _worksheetRels = worksheetRels;
 
     private enum SheetVisibility : byte
@@ -42,6 +43,11 @@ protected override Record ReadOverride(byte[] buffer, uint recordId, uint record
                 string name = GetString(buffer, offset + 4, nameLength);
 
                 return new SheetRecord(name, id, rid, state, rid != null && _worksheetRels.TryGetValue(rid, out var path) ? path : null);
+
+            case BrtBookView:                 
+                int activeSheet = (int)GetDWord(buffer, 24);
+                return new WorkbookActRecord(activeSheet);
+
             default:
                 return Record.Default;
         }
diff --git a/src/ExcelDataReader/Core/OpenXmlFormat/Records/WorkbookActRecord.cs b/src/ExcelDataReader/Core/OpenXmlFormat/Records/WorkbookActRecord.cs
new file mode 100644
index 00000000..f5723504
--- /dev/null
+++ b/src/ExcelDataReader/Core/OpenXmlFormat/Records/WorkbookActRecord.cs
@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ExcelDataReader.Core.OpenXmlFormat.Records;
+
+internal sealed class WorkbookActRecord : Record
+{
+    public WorkbookActRecord(int activeSheet)
+    {
+        this.ActiveSheet = activeSheet;
+    }
+
+    public int ActiveSheet { get; }
+}
diff --git a/src/ExcelDataReader/Core/OpenXmlFormat/XlsxWorkbook.cs b/src/ExcelDataReader/Core/OpenXmlFormat/XlsxWorkbook.cs
index 57ae651b..a96f5072 100644
--- a/src/ExcelDataReader/Core/OpenXmlFormat/XlsxWorkbook.cs
+++ b/src/ExcelDataReader/Core/OpenXmlFormat/XlsxWorkbook.cs
@@ -22,6 +22,8 @@ public XlsxWorkbook(ZipWorker zipWorker)
 
     public int ResultsCount => Sheets?.Count ?? -1;
 
+    public int ActiveSheet { get; private set; }
+
     public IEnumerable<XlsxWorksheet> ReadWorksheets()
     {
         foreach (var sheet in Sheets)
@@ -45,6 +47,9 @@ private void ReadWorkbook()
                 case SheetRecord sheet:
                     Sheets.Add(sheet);
                     break;
+                case WorkbookActRecord activeSheet:
+                    ActiveSheet = activeSheet.ActiveSheet;
+                    break;
             }
         }
     }
diff --git a/src/ExcelDataReader/Core/OpenXmlFormat/XlsxWorksheet.cs b/src/ExcelDataReader/Core/OpenXmlFormat/XlsxWorksheet.cs
index 35455f69..dc794872 100644
--- a/src/ExcelDataReader/Core/OpenXmlFormat/XlsxWorksheet.cs
+++ b/src/ExcelDataReader/Core/OpenXmlFormat/XlsxWorksheet.cs
@@ -91,6 +91,8 @@ public XlsxWorksheet(ZipWorker document, XlsxWorkbook workbook, SheetRecord refS
 
     public string VisibleState { get; }
 
+    public bool IsActiveSheet { get; }
+
     public HeaderFooter HeaderFooter { get; }
 
     public double DefaultRowHeight { get; }
diff --git a/src/ExcelDataReader/Core/OpenXmlFormat/XmlFormat/XmlWorkbookReader.cs b/src/ExcelDataReader/Core/OpenXmlFormat/XmlFormat/XmlWorkbookReader.cs
index 308b41cd..c10a4ff4 100644
--- a/src/ExcelDataReader/Core/OpenXmlFormat/XmlFormat/XmlWorkbookReader.cs
+++ b/src/ExcelDataReader/Core/OpenXmlFormat/XmlFormat/XmlWorkbookReader.cs
@@ -66,6 +66,28 @@ protected override IEnumerable<Record> ReadOverride()
                     }
                 }
             }
+            else if (Reader.IsStartElement("bookViews", ProperNamespaces.NsSpreadsheetMl))
+            {
+                if (!XmlReaderHelper.ReadFirstContent(Reader))
+                {
+                    continue;
+                }
+
+                while (!Reader.EOF)
+                {
+                    if (Reader.IsStartElement("workbookView", ProperNamespaces.NsSpreadsheetMl))
+                    {
+                        string activeTab = Reader.GetAttribute("activeTab");
+                        int activeTabInt = int.TryParse(activeTab, out var result) ? result : 0;
+                        yield return new WorkbookActRecord(activeTabInt);
+                        Reader.Skip();
+                    }
+                    else if (!XmlReaderHelper.SkipContent(Reader))
+                    {
+                        break;
+                    }
+                }
+            }
             else if (!XmlReaderHelper.SkipContent(Reader))
             {
                 yield break;
diff --git a/src/ExcelDataReader/ExcelDataReader.cs b/src/ExcelDataReader/ExcelDataReader.cs
index 8c0ffdc9..c489ada1 100644
--- a/src/ExcelDataReader/ExcelDataReader.cs
+++ b/src/ExcelDataReader/ExcelDataReader.cs
@@ -16,6 +16,7 @@ internal abstract class ExcelDataReader<TWorkbook, TWorksheet> : IExcelDataReade
     private IEnumerator<Row> _rowIterator;
     private IEnumerator<TWorksheet> _cachedWorksheetIterator;
     private List<TWorksheet> _cachedWorksheets;
+    private int _idx;
 
     ~ExcelDataReader()
     {
@@ -28,6 +29,10 @@ internal abstract class ExcelDataReader<TWorkbook, TWorksheet> : IExcelDataReade
 
     public string VisibleState => _worksheetIterator?.Current?.VisibleState;
 
+    public int ActiveSheet => this.Workbook.ActiveSheet;
+
+    public bool IsActiveSheet => _idx == this.Workbook.ActiveSheet;
+
     public HeaderFooter HeaderFooter => _worksheetIterator?.Current?.HeaderFooter;
 
     // We shouldn't expose the internal array here. 
@@ -213,11 +218,13 @@ public void Reset()
         _worksheetIterator = null;
         _rowIterator = null;
 
+        _idx = 0;
+
         ResetSheetData();
 
         if (Workbook != null)
         {
-            _worksheetIterator = ReadWorksheetsWithCache().GetEnumerator(); // Workbook.ReadWorksheets().GetEnumerator();
+            _worksheetIterator = ReadWorksheetsWithCache().GetEnumerator();
             if (!_worksheetIterator.MoveNext())
             {
                 _worksheetIterator.Dispose();
@@ -263,6 +270,9 @@ public bool NextResult()
         }
 
         _rowIterator = _worksheetIterator.Current.ReadRows().GetEnumerator();
+
+        _idx++;
+
         return true;
     }
 
diff --git a/src/ExcelDataReader/IExcelDataReader.cs b/src/ExcelDataReader/IExcelDataReader.cs
index f14a4ff1..13f48a3b 100644
--- a/src/ExcelDataReader/IExcelDataReader.cs
+++ b/src/ExcelDataReader/IExcelDataReader.cs
@@ -22,6 +22,16 @@ public interface IExcelDataReader : IDataReader
     /// </summary>
     string VisibleState { get; }
 
+    /// <summary>
+    /// Gets the active sheet.
+    /// </summary>
+    int ActiveSheet { get; }
+
+    /// <summary>
+    /// Gets a value indicating whether the worksheet is active.
+    /// </summary>       
+    bool IsActiveSheet { get; }
+
     /// <summary>
     /// Gets the sheet header and footer -or- <see langword="null"/> if none set.
     /// </summary>
diff --git a/src/TestData/Test_git_issue_642.xls b/src/TestData/Test_git_issue_642.xls
new file mode 100644
index 00000000..085d9e74
Binary files /dev/null and b/src/TestData/Test_git_issue_642.xls differ
diff --git a/src/TestData/Test_git_issue_642.xlsb b/src/TestData/Test_git_issue_642.xlsb
new file mode 100644
index 00000000..b16f6fbb
Binary files /dev/null and b/src/TestData/Test_git_issue_642.xlsb differ
diff --git a/src/TestData/Test_git_issue_642.xlsx b/src/TestData/Test_git_issue_642.xlsx
new file mode 100644
index 00000000..8a38c4f5
Binary files /dev/null and b/src/TestData/Test_git_issue_642.xlsx differ
diff --git a/src/TestData/Test_git_issue_642onesheet.xls b/src/TestData/Test_git_issue_642onesheet.xls
new file mode 100644
index 00000000..92295fc2
Binary files /dev/null and b/src/TestData/Test_git_issue_642onesheet.xls differ
diff --git a/src/TestData/Test_git_issue_642onesheet.xlsb b/src/TestData/Test_git_issue_642onesheet.xlsb
new file mode 100644
index 00000000..7793cd8e
Binary files /dev/null and b/src/TestData/Test_git_issue_642onesheet.xlsb differ
diff --git a/src/TestData/Test_git_issue_642onesheet.xlsx b/src/TestData/Test_git_issue_642onesheet.xlsx
new file mode 100644
index 00000000..a7f08112
Binary files /dev/null and b/src/TestData/Test_git_issue_642onesheet.xlsx differ