diff --git a/lib/Logitar.Identity.Core/IdentityException.cs b/lib/Logitar.Identity.Core/IdentityException.cs
new file mode 100644
index 0000000..ca8a836
--- /dev/null
+++ b/lib/Logitar.Identity.Core/IdentityException.cs
@@ -0,0 +1,16 @@
+namespace Logitar.Identity.Core;
+
+/// <summary>
+/// The base class of Identity exceptions.
+/// </summary>
+public abstract class IdentityException : Exception
+{
+  /// <summary>
+  /// Initializes a new instance of the <see cref="IdentityException"/> class.
+  /// </summary>
+  /// <param name="message">The exception message.</param>
+  /// <param name="innerException">The inner exception.</param>
+  protected IdentityException(string message, Exception? innerException = null) : base(message, innerException)
+  {
+  }
+}
diff --git a/lib/Logitar.Identity.Core/InvalidCredentialsException.cs b/lib/Logitar.Identity.Core/InvalidCredentialsException.cs
index e4f3c0f..2e65c0f 100644
--- a/lib/Logitar.Identity.Core/InvalidCredentialsException.cs
+++ b/lib/Logitar.Identity.Core/InvalidCredentialsException.cs
@@ -3,7 +3,7 @@
 /// <summary>
 /// The exception raised when credential validation failed.
 /// </summary>
-public class InvalidCredentialsException : Exception
+public class InvalidCredentialsException : IdentityException
 {
   /// <summary>
   /// A generic error message for this exception.
diff --git a/lib/Logitar.Identity.Core/TenantMismatchException.cs b/lib/Logitar.Identity.Core/TenantMismatchException.cs
index 816e077..b91f47c 100644
--- a/lib/Logitar.Identity.Core/TenantMismatchException.cs
+++ b/lib/Logitar.Identity.Core/TenantMismatchException.cs
@@ -3,7 +3,7 @@
 /// <summary>
 /// The exception raised when an association is made between two entities in different tenants.
 /// </summary>
-public class TenantMismatchException : Exception
+public class TenantMismatchException : IdentityException
 {
   /// <summary>
   /// A generic error message for this exception.