diff --git a/clang-tools-extra/clang-tidy/bugprone/BugproneTidyModule.cpp b/clang-tools-extra/clang-tidy/bugprone/BugproneTidyModule.cpp
--- a/clang-tools-extra/clang-tidy/bugprone/BugproneTidyModule.cpp
+++ b/clang-tools-extra/clang-tidy/bugprone/BugproneTidyModule.cpp
@@ -26,6 +26,7 @@
 #include "ForwardingReferenceOverloadCheck.h"
 #include "ImplicitWideningOfMultiplicationResultCheck.h"
 #include "InaccurateEraseCheck.h"
+#include "SwitchMissingDefaultCaseCheck.h"
 #include "IncorrectRoundingsCheck.h"
 #include "InfiniteLoopCheck.h"
 #include "IntegerDivisionCheck.h"
@@ -116,6 +117,8 @@
         "bugprone-implicit-widening-of-multiplication-result");
     CheckFactories.registerCheck<InaccurateEraseCheck>(
         "bugprone-inaccurate-erase");
+    CheckFactories.registerCheck<SwitchMissingDefaultCaseCheck>(
+        "bugprone-switch-missing-default-case");
     CheckFactories.registerCheck<IncorrectRoundingsCheck>(
         "bugprone-incorrect-roundings");
     CheckFactories.registerCheck<InfiniteLoopCheck>("bugprone-infinite-loop");
diff --git a/clang-tools-extra/clang-tidy/bugprone/CMakeLists.txt b/clang-tools-extra/clang-tidy/bugprone/CMakeLists.txt
--- a/clang-tools-extra/clang-tidy/bugprone/CMakeLists.txt
+++ b/clang-tools-extra/clang-tidy/bugprone/CMakeLists.txt
@@ -21,6 +21,7 @@
   ForwardingReferenceOverloadCheck.cpp
   ImplicitWideningOfMultiplicationResultCheck.cpp
   InaccurateEraseCheck.cpp
+  SwitchMissingDefaultCaseCheck.cpp
   IncorrectRoundingsCheck.cpp
   InfiniteLoopCheck.cpp
   IntegerDivisionCheck.cpp
diff --git a/clang-tools-extra/clang-tidy/bugprone/SwitchMissingDefaultCaseCheck.h b/clang-tools-extra/clang-tidy/bugprone/SwitchMissingDefaultCaseCheck.h
new file mode 100644
--- /dev/null
+++ b/clang-tools-extra/clang-tidy/bugprone/SwitchMissingDefaultCaseCheck.h
@@ -0,0 +1,29 @@
+//===--- SwitchMissingDefaultCaseCheck.h - clang-tidy -----------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_SWITCHMISSINGDEFAULTCASECHECK_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_SWITCHMISSINGDEFAULTCASECHECK_H
+
+#include "../ClangTidyCheck.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "clang/ASTMatchers/ASTMatchers.h"
+
+namespace clang::tidy::bugprone {
+
+class SwitchMissingDefaultCaseCheck : public ClangTidyCheck {
+public:
+  SwitchMissingDefaultCaseCheck(StringRef Name, ClangTidyContext *Context)
+      : ClangTidyCheck(Name, Context) {}
+
+  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+};
+
+} // namespace clang::tidy::bugprone
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_SWITCHMISSINGDEFAULTCASECHECK_H
diff --git a/clang-tools-extra/clang-tidy/bugprone/SwitchMissingDefaultCaseCheck.cpp b/clang-tools-extra/clang-tidy/bugprone/SwitchMissingDefaultCaseCheck.cpp
new file mode 100644
--- /dev/null
+++ b/clang-tools-extra/clang-tidy/bugprone/SwitchMissingDefaultCaseCheck.cpp
@@ -0,0 +1,36 @@
+//===--- SwitchMissingDefaultCaseCheck.cpp - clang-tidy -------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "SwitchMissingDefaultCaseCheck.h"
+#include "clang/AST/ASTContext.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang::tidy::bugprone {
+
+void SwitchMissingDefaultCaseCheck::registerMatchers(
+    ast_matchers::MatchFinder *Finder) {
+  Finder->addMatcher(
+      switchStmt(has(implicitCastExpr().bind("cast")),
+                 unless(hasAncestor(switchStmt(has(defaultStmt())))))
+          .bind("switch"),
+      this);
+}
+
+void SwitchMissingDefaultCaseCheck::check(
+    const ast_matchers::MatchFinder::MatchResult &Result) {
+  const auto *c = Result.Nodes.getNodeAs<ImplicitCastExpr>("cast");
+  if (c->getCastKind() == CK_IntegralCast)
+    return;
+
+  const auto *s = Result.Nodes.getNodeAs<SwitchStmt>("switch");
+  diag(s->getSwitchLoc(), "switching on non-enum value without "
+                          "default case may not cover all cases");
+}
+
+} // namespace clang::tidy::bugprone
diff --git a/clang-tools-extra/docs/ReleaseNotes.rst b/clang-tools-extra/docs/ReleaseNotes.rst
--- a/clang-tools-extra/docs/ReleaseNotes.rst
+++ b/clang-tools-extra/docs/ReleaseNotes.rst
@@ -219,6 +219,11 @@
   Enforces consistent token representation for invoked binary, unary and
   overloaded operators in C++ code.
 
+- New :doc:`bugprone-switch-missing-default-case
+  <clang-tidy/checks/bugprone/switch-missing-default-case>` check.
+
+  Detects incomplete switch statements without a default case.
+
 New check aliases
 ^^^^^^^^^^^^^^^^^
 
diff --git a/clang-tools-extra/docs/clang-tidy/checks/list.rst b/clang-tools-extra/docs/clang-tidy/checks/list.rst
--- a/clang-tools-extra/docs/clang-tidy/checks/list.rst
+++ b/clang-tools-extra/docs/clang-tidy/checks/list.rst
@@ -92,6 +92,7 @@
    `bugprone-forwarding-reference-overload <bugprone/forwarding-reference-overload.html>`_,
    `bugprone-implicit-widening-of-multiplication-result <bugprone/implicit-widening-of-multiplication-result.html>`_, "Yes"
    `bugprone-inaccurate-erase <bugprone/inaccurate-erase.html>`_, "Yes"
+   `bugprone-switch-missing-default-case <bugprone/switch-missing-default-case.html>`_, "Yes"
    `bugprone-incorrect-roundings <bugprone/incorrect-roundings.html>`_,
    `bugprone-infinite-loop <bugprone/infinite-loop.html>`_,
    `bugprone-integer-division <bugprone/integer-division.html>`_,
diff --git a/clang-tools-extra/test/clang-tidy/checkers/bugprone/switch-missing-default-case.cpp b/clang-tools-extra/test/clang-tidy/checkers/bugprone/switch-missing-default-case.cpp
new file mode 100644
--- /dev/null
+++ b/clang-tools-extra/test/clang-tidy/checkers/bugprone/switch-missing-default-case.cpp
@@ -0,0 +1,27 @@
+// RUN: clang-tidy --checks='-*,misc-incomplete-switch' %s -- | FileCheck -implicit-check-not="{{warning|error}}:" %s
+
+void Positive() {
+  int i = 0;
+  // CHECK: [[@LINE+1]]:11: warning: switching on non-enum value without default case may not cover all cases [misc-incomplete-switch]
+  switch (i) {
+  case 0:
+    break;
+  }
+}
+
+void Negative() {
+  enum E { eE1 };
+  E e = eE1;
+  switch (e) { // no-warning
+  case eE1:
+    break;
+  }
+
+  int i = 0;
+  switch (i) { // no-warning
+  case 0:
+    break;
+  default:
+    break;
+  }
+}