diff --git a/clang-tools-extra/clangd/XRefs.cpp b/clang-tools-extra/clangd/XRefs.cpp
--- a/clang-tools-extra/clangd/XRefs.cpp
+++ b/clang-tools-extra/clangd/XRefs.cpp
@@ -78,6 +78,18 @@
     return VD->getDefinition();
   if (const auto *FD = dyn_cast<FunctionDecl>(D))
     return FD->getDefinition();
+  if (const auto *PD = dyn_cast<ObjCProtocolDecl>(D))
+    return PD->getDefinition();
+  // Objective-C classes can have three types of declarations:
+  //
+  // - forward declaration: @class MyClass;
+  // - definition declaration: @interface MyClass ... @end
+  // - implementation: @implementation MyClass ... @end
+  if (const auto *ID = dyn_cast<ObjCInterfaceDecl>(D)) {
+    if (const auto *IMD = ID->getImplementation())
+      return IMD;
+    return ID->getDefinition();
+  }
   // Only a single declaration is allowed.
   if (isa<ValueDecl>(D) || isa<TemplateTypeParmDecl>(D) ||
       isa<TemplateTemplateParmDecl>(D)) // except cases above
diff --git a/clang-tools-extra/clangd/unittests/XRefsTests.cpp b/clang-tools-extra/clangd/unittests/XRefsTests.cpp
--- a/clang-tools-extra/clangd/unittests/XRefsTests.cpp
+++ b/clang-tools-extra/clangd/unittests/XRefsTests.cpp
@@ -674,7 +674,37 @@
           enum class E { [[A]], B };
           E e = E::A^;
         };
-      )cpp"};
+      )cpp",
+
+      R"objc(//objc
+        @protocol $decl[[Dog]];
+        @protocol $def[[Dog]]
+        - (void)bark;
+        @end
+        id<Do^g> getDoggo() {
+          return 0;
+        }
+      )objc",
+
+      R"objc(//objc
+        @class $decl[[Foo]];
+        @interface $def[[Foo]]
+        @end
+        Fo^o * getFoo() {
+          return 0;
+        }
+      )objc",
+
+      R"objc(//objc
+        @class $decl[[Foo]];
+        @interface Foo
+        @end
+        @implementation $def[[Foo]]
+        @end
+        Fo^o * getFoo() {
+          return 0;
+        }
+      )objc"};
   for (const char *Test : Tests) {
     Annotations T(Test);
     llvm::Optional<Range> WantDecl;
@@ -689,6 +719,11 @@
     TestTU TU;
     TU.Code = std::string(T.code());
 
+    std::string ObjcPrefix = "//objc";
+    if (strncmp(Test, ObjcPrefix.c_str(), ObjcPrefix.size()) == 0) {
+      TU.Filename = "TestTU.m";
+    }
+
     // FIXME: Auto-completion in a template requires disabling delayed template
     // parsing.
     TU.ExtraArgs.push_back("-fno-delayed-template-parsing");