diff --git a/clang-tools-extra/clangd/InlayHints.cpp b/clang-tools-extra/clangd/InlayHints.cpp
--- a/clang-tools-extra/clangd/InlayHints.cpp
+++ b/clang-tools-extra/clangd/InlayHints.cpp
@@ -296,14 +296,24 @@
       return true;
     }
 
-    if (D->getType()->getContainedAutoType()) {
-      if (!D->getType()->isDependentType()) {
+    auto T = D->getType();
+
+    // Show type hint for `decltype(expr)`, e.g.
+    // for `decltype(0) i;`, show `decltype(0) i: int;`
+    if (const auto *DT = llvm::dyn_cast<DecltypeType>(T)) {
+      if (auto UT = DT->getUnderlyingType(); !UT->isDependentType())
+        addTypeHint(D->getLocation(), UT, /*Prefix=*/": ");
+      return true;
+    }
+
+    if (T->getContainedAutoType()) {
+      if (!T->isDependentType()) {
         // Our current approach is to place the hint on the variable
         // and accordingly print the full type
         // (e.g. for `const auto& x = 42`, print `const int&`).
         // Alternatively, we could place the hint on the `auto`
         // (and then just print the type deduced for the `auto`).
-        addTypeHint(D->getLocation(), D->getType(), /*Prefix=*/": ");
+        addTypeHint(D->getLocation(), T, /*Prefix=*/": ");
       }
     }
 
diff --git a/clang-tools-extra/clangd/unittests/InlayHintTests.cpp b/clang-tools-extra/clangd/unittests/InlayHintTests.cpp
--- a/clang-tools-extra/clangd/unittests/InlayHintTests.cpp
+++ b/clang-tools-extra/clangd/unittests/InlayHintTests.cpp
@@ -1141,6 +1141,10 @@
                   ExpectedHint{": int &", "z"});
 }
 
+TEST(TypeHints, Decltype) {
+  assertTypeHints("decltype(0) $i[[i]];", ExpectedHint{": int", "i"});
+}
+
 TEST(TypeHints, NoQualifiers) {
   assertTypeHints(R"cpp(
     namespace A {