diff --git a/PowerKit.Tests/FunctionalExtensionsTests.cs b/PowerKit.Tests/FunctionalExtensionsTests.cs
index ee9c76c..aea8a25 100644
--- a/PowerKit.Tests/FunctionalExtensionsTests.cs
+++ b/PowerKit.Tests/FunctionalExtensionsTests.cs
@@ -15,6 +15,14 @@ public void Pipe_Test()
         "hello".Pipe(s => s.ToUpper()).Pipe(s => s + "!").Should().Be("HELLO!");
     }
 
+    [Fact]
+    public void NullIf_ReferenceType_Test()
+    {
+        // Act & assert
+        "hello".NullIf(v => v == "hello").Should().BeNull();
+        "world".NullIf(v => v == "hello").Should().Be("world");
+    }
+
     [Fact]
     public void NullIf_Test()
     {
diff --git a/PowerKit/Extensions/FunctionalExtensions.cs b/PowerKit/Extensions/FunctionalExtensions.cs
index 894c3d1..da3ca49 100644
--- a/PowerKit/Extensions/FunctionalExtensions.cs
+++ b/PowerKit/Extensions/FunctionalExtensions.cs
@@ -42,3 +42,18 @@ internal static class FunctionalExtensions
         public string? NullIfWhiteSpace() => !string.IsNullOrWhiteSpace(value) ? value : null;
     }
 }
+
+// Separate class because C# (CS0111) does not allow two generic methods with identical
+// parameter types that differ only by constraint (class vs struct) in the same class.
+internal static class ReferenceTypeFunctionalExtensions
+{
+    extension<T>(T value)
+        where T : class
+    {
+        /// <summary>
+        /// Returns <see langword="null" /> if the value is <see langword="null" /> or matches the specified predicate;
+        /// otherwise, returns the value.
+        /// </summary>
+        public T? NullIf(Func<T, bool> predicate) => value?.Pipe(v => !predicate(v) ? v : null);
+    }
+}