diff --git a/src/gn/header_checker.cc b/src/gn/header_checker.cc
index 344c85ad..97ea8b99 100644
--- a/src/gn/header_checker.cc
+++ b/src/gn/header_checker.cc
@@ -288,7 +288,7 @@ std::vector<HeaderChecker::FileInformation> HeaderChecker::FilesToCheck(
     }
 
     // All generated files, including action outputs, are in the output dir.
-    const bool in_output_dir = IsFileInOuputDir(info.file);
+    const bool in_output_dir = IsFileInOutputDir(info.file);
 
     TargetVector targets_to_check;
     for (const auto& vect_i : info.targets) {
@@ -383,7 +383,7 @@ void HeaderChecker::AddTargetToFileMap(const Target* target, FileMap* dest) {
   }
 }
 
-bool HeaderChecker::IsFileInOuputDir(const SourceFile& file) const {
+bool HeaderChecker::IsFileInOutputDir(const SourceFile& file) const {
   const std::string& build_dir = build_settings_->build_dir().value();
   return file.value().starts_with(build_dir);
 }
@@ -530,7 +530,7 @@ bool HeaderChecker::CheckFile(const TargetVector& targets,
   // target. These won't exist at checking time. Since we require all generated
   // files to be somewhere in the output tree, we can just check the name to
   // see if they should be skipped.
-  if (!check_generated_ && IsFileInOuputDir(file))
+  if (!check_generated_ && IsFileInOutputDir(file))
     return true;
 
   base::FilePath path = build_settings_->GetFullPath(file);
@@ -538,7 +538,7 @@ bool HeaderChecker::CheckFile(const TargetVector& targets,
   if (!base::ReadFileToString(path, &contents)) {
     // A missing (not yet) generated file is an acceptable problem
     // considering this code does not understand conditional includes.
-    if (IsFileInOuputDir(file))
+    if (IsFileInOutputDir(file))
       return true;
 
     for (const TargetInfo& from_target_info : targets) {
diff --git a/src/gn/header_checker.h b/src/gn/header_checker.h
index 51b12f46..14f4eaf7 100644
--- a/src/gn/header_checker.h
+++ b/src/gn/header_checker.h
@@ -300,7 +300,7 @@ class HeaderChecker : public base::RefCountedThreadSafe<HeaderChecker> {
   static void AddTargetToFileMap(const Target* target, FileMap* dest);
 
   // Returns true if the given file is in the output directory.
-  bool IsFileInOuputDir(const SourceFile& file) const;
+  bool IsFileInOutputDir(const SourceFile& file) const;
 
   // Resolves the contents of an include to a SourceFile.
   SourceFile SourceFileForInclude(const IncludeStringWithLocation& include,
diff --git a/src/gn/substitution_writer.h b/src/gn/substitution_writer.h
index 95e4b94a..e4f26592 100644
--- a/src/gn/substitution_writer.h
+++ b/src/gn/substitution_writer.h
@@ -82,7 +82,7 @@ class SubstitutionWriter {
   // as either a string, a SourceFile or an OutputFile. If the result is
   // expected to be a SourceFile or an OutputFile, this will CHECK if the
   // result isn't in the correct directory. The caller should validate this
-  // first (see for example IsFileInOuputDir).
+  // first (see for example IsFileInOutputDir).
   //
   // The target can be null (see class comment above).
   static SourceFile ApplyPatternToSource(const Target* target,
diff --git a/src/gn/target_unittest.cc b/src/gn/target_unittest.cc
index 5518761e..f36f7f26 100644
--- a/src/gn/target_unittest.cc
+++ b/src/gn/target_unittest.cc
@@ -606,7 +606,7 @@ TEST_F(TargetTest, RustLinkAndDepOutputs) {
 // solink tools.
 //
 // Also tests GetOutputsAsSourceFiles() for binaries (the setup is the same).
-TEST_F(TargetTest, RuntimeOuputs) {
+TEST_F(TargetTest, RuntimeOutputs) {
   TestWithScope setup;
   Err err;
 
@@ -659,7 +659,7 @@ TEST_F(TargetTest, RuntimeOuputs) {
   EXPECT_EQ("//out/Debug/a.pdb", computed_outputs[2].value());
 }
 
-TEST_F(TargetTest, RustRuntimeOuputs) {
+TEST_F(TargetTest, RustRuntimeOutputs) {
   TestWithScope setup;
   Err err;