diff --git a/clang-tools-extra/clang-tidy/bugprone/NotNullTerminatedResultCheck.cpp b/clang-tools-extra/clang-tidy/bugprone/NotNullTerminatedResultCheck.cpp
index 4c9b546e225fe..e49688b96be74 100644
--- a/clang-tools-extra/clang-tidy/bugprone/NotNullTerminatedResultCheck.cpp
+++ b/clang-tools-extra/clang-tidy/bugprone/NotNullTerminatedResultCheck.cpp
@@ -393,7 +393,7 @@ static bool isDestExprFix(const MatchFinder::MatchResult &Result,
 }
 
 // If the destination array is the same length as the given length we have to
-// increase the capacity by one to create space for the the null terminator.
+// increase the capacity by one to create space for the null terminator.
 static bool isDestCapacityFix(const MatchFinder::MatchResult &Result,
                               DiagnosticBuilder &Diag) {
   bool IsOverflows = isDestCapacityOverflows(Result);
diff --git a/clang-tools-extra/clang-tidy/modernize/LoopConvertUtils.cpp b/clang-tools-extra/clang-tidy/modernize/LoopConvertUtils.cpp
index 0389a6148954d..6cb4276ce1b83 100644
--- a/clang-tools-extra/clang-tidy/modernize/LoopConvertUtils.cpp
+++ b/clang-tools-extra/clang-tidy/modernize/LoopConvertUtils.cpp
@@ -867,7 +867,7 @@ std::string VariableNamer::createIndexName() {
   return OldIndex->getName();
 }
 
-/// Determines whether or not the the name \a Symbol conflicts with
+/// Determines whether or not the name \a Symbol conflicts with
 /// language keywords or defined macros. Also checks if the name exists in
 /// LoopContext, any of its parent contexts, or any of its child statements.
 ///
diff --git a/clang-tools-extra/clang-tidy/modernize/LoopConvertUtils.h b/clang-tools-extra/clang-tidy/modernize/LoopConvertUtils.h
index 9aea8f6ca57ff..b2cba8c0172ae 100644
--- a/clang-tools-extra/clang-tidy/modernize/LoopConvertUtils.h
+++ b/clang-tools-extra/clang-tidy/modernize/LoopConvertUtils.h
@@ -145,7 +145,7 @@ class DependencyFinderASTVisitor
   ///
   /// In order to avoid this, this class looks at the container expression
   /// `arr[k]` and decides whether or not it contains a sub-expression declared
-  /// within the the loop body.
+  /// within the loop body.
   bool dependsOnInsideVariable(const clang::Stmt *Body) {
     DependsOnInsideVariable = false;
     TraverseStmt(const_cast<clang::Stmt *>(Body));
diff --git a/clang-tools-extra/clang-tidy/modernize/ReplaceAutoPtrCheck.cpp b/clang-tools-extra/clang-tidy/modernize/ReplaceAutoPtrCheck.cpp
index 8a2d7f028d4b8..9ed13775dd72e 100644
--- a/clang-tools-extra/clang-tidy/modernize/ReplaceAutoPtrCheck.cpp
+++ b/clang-tools-extra/clang-tidy/modernize/ReplaceAutoPtrCheck.cpp
@@ -114,7 +114,7 @@ void ReplaceAutoPtrCheck::registerMatchers(MatchFinder *Finder) {
                      this);
 
   // Find ownership transfers via copy construction and assignment.
-  // AutoPtrOwnershipTransferId is bound to the the part that has to be wrapped
+  // AutoPtrOwnershipTransferId is bound to the part that has to be wrapped
   // into std::move().
   //   std::auto_ptr<int> i, j;
   //   i = j;
diff --git a/clang-tools-extra/clangd/CodeComplete.h b/clang-tools-extra/clangd/CodeComplete.h
index dda4f44590cd4..fd01dfd80b0e6 100644
--- a/clang-tools-extra/clangd/CodeComplete.h
+++ b/clang-tools-extra/clangd/CodeComplete.h
@@ -61,7 +61,7 @@ struct CodeCompleteOptions {
   bool IncludeIneligibleResults = false;
 
   /// Combine overloads into a single completion item where possible.
-  /// If none, the the implementation may choose an appropriate behavior.
+  /// If none, the implementation may choose an appropriate behavior.
   /// (In practice, ClangdLSPServer enables bundling if the client claims
   /// to supports signature help).
   llvm::Optional<bool> BundleOverloads;
diff --git a/clang-tools-extra/clangd/unittests/TweakTests.cpp b/clang-tools-extra/clangd/unittests/TweakTests.cpp
index 8627439d4555b..88decb6a04ef4 100644
--- a/clang-tools-extra/clangd/unittests/TweakTests.cpp
+++ b/clang-tools-extra/clangd/unittests/TweakTests.cpp
@@ -127,7 +127,7 @@ TEST_F(ObjCLocalizeStringLiteralTest, Test) {
   ExtraArgs.push_back("-x");
   ExtraArgs.push_back("objective-c");
 
-  // Ensure the the action can be initiated in the string literal.
+  // Ensure the action can be initiated in the string literal.
   EXPECT_AVAILABLE(R"(id x = ^[[@[[^"^t^est^"]]]];)");
 
   // Ensure that the action can't be initiated in other places.
diff --git a/clang-tools-extra/docs/doxygen.cfg.in b/clang-tools-extra/docs/doxygen.cfg.in
index 3554171ee1188..56c7b74298e33 100644
--- a/clang-tools-extra/docs/doxygen.cfg.in
+++ b/clang-tools-extra/docs/doxygen.cfg.in
@@ -46,7 +46,7 @@ PROJECT_NUMBER         = @PACKAGE_VERSION@
 
 PROJECT_BRIEF          =
 
-# With the PROJECT_LOGO tag one can specify an logo or icon that is included in
+# With the PROJECT_LOGO tag one can specify a logo or icon that is included in
 # the documentation. The maximum height of the logo should not exceed 55 pixels
 # and the maximum width should not exceed 200 pixels. Doxygen will copy the logo
 # to the output directory.