diff --git a/src/Docfx.Dotnet/ManagedReference/Resolvers/SetDerivedClass.cs b/src/Docfx.Dotnet/ManagedReference/Resolvers/SetDerivedClass.cs
index cb23287b342..c134113a26a 100644
--- a/src/Docfx.Dotnet/ManagedReference/Resolvers/SetDerivedClass.cs
+++ b/src/Docfx.Dotnet/ManagedReference/Resolvers/SetDerivedClass.cs
@@ -1,6 +1,7 @@
-// Licensed to the .NET Foundation under one or more agreements.
+// Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System.Runtime.InteropServices;
 using Docfx.DataContracts.ManagedReference;
 
 namespace Docfx.Dotnet;
@@ -22,6 +23,7 @@ private void UpdateDerivedClassMapping(List<MetadataItem> items, Dictionary<stri
     {
         foreach (var item in items ?? Enumerable.Empty<MetadataItem>())
         {
+            // Handle class inheritance
             var inheritance = item.Inheritance;
             if (inheritance is { Count: > 0 })
             {
@@ -35,15 +37,30 @@ private void UpdateDerivedClassMapping(List<MetadataItem> items, Dictionary<stri
                 // ignore System.Object's derived class
                 if (superClass != "System.Object")
                 {
-                    if (_derivedClassMapping.TryGetValue(superClass, out List<string> derivedClasses))
-                    {
+                    ref var derivedClasses = ref CollectionsMarshal.GetValueRefOrAddDefault(_derivedClassMapping, superClass, out var exists);
+                    if (exists)
                         derivedClasses.Add(item.Name);
-                    }
                     else
-                    {
-                        _derivedClassMapping.Add(superClass, [item.Name]);
-                    }
+                        derivedClasses = [item.Name];
+                }
+            }
+
+            // Handle interface implementations
+            var implements = item.Implements;
+            if (implements is { Count: > 0 })
+            {
+                var superClass = implements[implements.Count - 1];
+
+                if (reference.TryGetValue(superClass, out var referenceItem))
+                {
+                    superClass = referenceItem.Definition ?? superClass;
                 }
+
+                ref var derivedClasses = ref CollectionsMarshal.GetValueRefOrAddDefault(_derivedClassMapping, superClass, out var exists);
+                if (exists)
+                    derivedClasses.Add(item.Name);
+                else
+                    derivedClasses = [item.Name];
             }
         }
     }
@@ -52,13 +69,16 @@ private void AppendDerivedClass(List<MetadataItem> items)
     {
         foreach (var item in items ?? Enumerable.Empty<MetadataItem>())
         {
-            if (item.Type == MemberType.Class)
+            switch (item.Type)
             {
-                if (_derivedClassMapping.TryGetValue(item.Name, out List<string> derivedClasses))
-                {
-                    derivedClasses.Sort();
-                    item.DerivedClasses = derivedClasses;
-                }
+                case MemberType.Class:
+                case MemberType.Interface:
+                    if (_derivedClassMapping.TryGetValue(item.Name, out List<string> derivedClasses))
+                    {
+                        derivedClasses.Sort();
+                        item.DerivedClasses = derivedClasses;
+                    }
+                    continue;
             }
         }
     }
diff --git a/test/docfx.Snapshot.Tests/SamplesTest.CSharp/api/CSharp11.StaticAbstractMembersInInterfaces.IGetNext-1.html.view.verified.json b/test/docfx.Snapshot.Tests/SamplesTest.CSharp/api/CSharp11.StaticAbstractMembersInInterfaces.IGetNext-1.html.view.verified.json
index a550122c93e..8ce41735e97 100644
--- a/test/docfx.Snapshot.Tests/SamplesTest.CSharp/api/CSharp11.StaticAbstractMembersInInterfaces.IGetNext-1.html.view.verified.json
+++ b/test/docfx.Snapshot.Tests/SamplesTest.CSharp/api/CSharp11.StaticAbstractMembersInInterfaces.IGetNext-1.html.view.verified.json
@@ -396,6 +396,24 @@
       }
     ]
   },
+  "derivedClasses": [
+    {
+      "isEii": false,
+      "isExtensionMethod": false,
+      "specName": [
+        {
+          "lang": "csharp",
+          "value": "<xref uid=\"CSharp11.StaticAbstractMembersInInterfaces.RepeatSequence\" displayProperty=\"name\"/>"
+        },
+        {
+          "lang": "vb",
+          "value": "<xref uid=\"CSharp11.StaticAbstractMembersInInterfaces.RepeatSequence\" displayProperty=\"name\"/>"
+        }
+      ],
+      "level": 0,
+      "index": 1
+    }
+  ],
   "level": 0,
   "_systemKeys": [
     "uid",
diff --git a/test/docfx.Snapshot.Tests/SamplesTest.Seed/api/BuildFromProject.Class1.IIssue8948.html.view.verified.json b/test/docfx.Snapshot.Tests/SamplesTest.Seed/api/BuildFromProject.Class1.IIssue8948.html.view.verified.json
index 29157d2d34e..838e806223b 100644
--- a/test/docfx.Snapshot.Tests/SamplesTest.Seed/api/BuildFromProject.Class1.IIssue8948.html.view.verified.json
+++ b/test/docfx.Snapshot.Tests/SamplesTest.Seed/api/BuildFromProject.Class1.IIssue8948.html.view.verified.json
@@ -305,6 +305,24 @@
       }
     ]
   },
+  "derivedClasses": [
+    {
+      "isEii": false,
+      "isExtensionMethod": false,
+      "specName": [
+        {
+          "lang": "csharp",
+          "value": "<xref uid=\"BuildFromProject.Class1.Issue8948\" displayProperty=\"name\"/>"
+        },
+        {
+          "lang": "vb",
+          "value": "<xref uid=\"BuildFromProject.Class1.Issue8948\" displayProperty=\"name\"/>"
+        }
+      ],
+      "level": 0,
+      "index": 1
+    }
+  ],
   "level": 0,
   "_appName": "Seed",
   "_appTitle": "docfx seed website",
diff --git a/test/docfx.Snapshot.Tests/SamplesTest.Seed/api/BuildFromProject.Inheritdoc.Issue9736.IJsonApiOptions.html.view.verified.json b/test/docfx.Snapshot.Tests/SamplesTest.Seed/api/BuildFromProject.Inheritdoc.Issue9736.IJsonApiOptions.html.view.verified.json
index d0666050a9e..49fe6065d99 100644
--- a/test/docfx.Snapshot.Tests/SamplesTest.Seed/api/BuildFromProject.Inheritdoc.Issue9736.IJsonApiOptions.html.view.verified.json
+++ b/test/docfx.Snapshot.Tests/SamplesTest.Seed/api/BuildFromProject.Inheritdoc.Issue9736.IJsonApiOptions.html.view.verified.json
@@ -348,6 +348,24 @@
       }
     ]
   },
+  "derivedClasses": [
+    {
+      "isEii": false,
+      "isExtensionMethod": false,
+      "specName": [
+        {
+          "lang": "csharp",
+          "value": "<xref uid=\"BuildFromProject.Inheritdoc.Issue9736.JsonApiOptions\" displayProperty=\"name\"/>"
+        },
+        {
+          "lang": "vb",
+          "value": "<xref uid=\"BuildFromProject.Inheritdoc.Issue9736.JsonApiOptions\" displayProperty=\"name\"/>"
+        }
+      ],
+      "level": 0,
+      "index": 1
+    }
+  ],
   "level": 0,
   "_appName": "Seed",
   "_appTitle": "docfx seed website",
diff --git a/test/docfx.Snapshot.Tests/SamplesTest.Seed/api/CatLibrary.IAnimal.html.view.verified.json b/test/docfx.Snapshot.Tests/SamplesTest.Seed/api/CatLibrary.IAnimal.html.view.verified.json
index 3d76c107a9a..daecc8f53e9 100644
--- a/test/docfx.Snapshot.Tests/SamplesTest.Seed/api/CatLibrary.IAnimal.html.view.verified.json
+++ b/test/docfx.Snapshot.Tests/SamplesTest.Seed/api/CatLibrary.IAnimal.html.view.verified.json
@@ -1099,6 +1099,24 @@
       }
     ]
   },
+  "derivedClasses": [
+    {
+      "isEii": false,
+      "isExtensionMethod": false,
+      "specName": [
+        {
+          "lang": "csharp",
+          "value": "<xref uid=\"CatLibrary.Cat`2\" displayProperty=\"name\"/>"
+        },
+        {
+          "lang": "vb",
+          "value": "<xref uid=\"CatLibrary.Cat`2\" displayProperty=\"name\"/>"
+        }
+      ],
+      "level": 0,
+      "index": 1
+    }
+  ],
   "level": 0,
   "conceptual": "<h3 id=\"welcome-to-the-animal-world\" sourcefile=\"specs/CatLibrary.IAnimal.md\" sourcestartlinenumber=\"6\">Welcome to the <strong sourcefile=\"specs/CatLibrary.IAnimal.md\" sourcestartlinenumber=\"6\">Animal</strong> world!</h3>\n",
   "_appName": "Seed",