diff --git a/ash/system/power/power_status.h b/ash/system/power/power_status.h
index 47dfe30b98ffea..d46bbbf17d044b 100644
--- a/ash/system/power/power_status.h
+++ b/ash/system/power/power_status.h
@@ -188,7 +188,7 @@ class ASH_EXPORT PowerStatus : public chromeos::PowerManagerClient::Observer {
                                         SkColor bg_color,
                                         SkColor fg_color);
 
-  // Returns an string describing the current state for accessibility.
+  // Returns a string describing the current state for accessibility.
   base::string16 GetAccessibleNameString(bool full_description) const;
 
   // Returns status strings that are generated by current PowerStatus.
diff --git a/chrome/test/data/extensions/input_ime/main.js b/chrome/test/data/extensions/input_ime/main.js
index f639d5f8ddd0f2..16698689da0a48 100644
--- a/chrome/test/data/extensions/input_ime/main.js
+++ b/chrome/test/data/extensions/input_ime/main.js
@@ -238,7 +238,7 @@ EngineBridge.prototype = {
   /**
    * Returns active engine ID. Returns null if there is no active engine.
    * @this EngineBridge
-   * @return {string} An string which identify the engine.
+   * @return {string} A string that identifies the engine.
    **/
   getActiveEngineID: function() {
     return this.activeEngine_;
diff --git a/components/policy/proto/device_management_backend.proto b/components/policy/proto/device_management_backend.proto
index b4c87a3d15fa2d..f5635c05fe73ca 100644
--- a/components/policy/proto/device_management_backend.proto
+++ b/components/policy/proto/device_management_backend.proto
@@ -905,7 +905,7 @@ message AppStatus {
 
 // Chrome user profile level status.
 message ChromeUserProfileReport {
-  // An string to uniquely identify this profile within the browser.
+  // A string to uniquely identify this profile within the browser.
   optional string id = 1;
   // A JSON encoded string containing both the “email” and “id” (obfuscated
   // GaiaID) of the user signed in to the Chrome browser, if any.
diff --git a/net/tools/cachetool/cachetool.cc b/net/tools/cachetool/cachetool.cc
index 8dffa6dc74e745..326f960b54f6e0 100644
--- a/net/tools/cachetool/cachetool.cc
+++ b/net/tools/cachetool/cachetool.cc
@@ -101,7 +101,7 @@ class CommandMarshal {
     return index;
   }
 
-  // Reads the next parameter as an string.
+  // Reads the next parameter as a string.
   virtual std::string ReadString() = 0;
 
   // Reads the next parameter from stdin as string.
diff --git a/sandbox/win/src/policy_engine_opcodes.h b/sandbox/win/src/policy_engine_opcodes.h
index 53a5c5a5ce0ee7..22d1ee241b83f0 100644
--- a/sandbox/win/src/policy_engine_opcodes.h
+++ b/sandbox/win/src/policy_engine_opcodes.h
@@ -170,7 +170,7 @@ class PolicyOpcode {
     *reinterpret_cast<T*>(&arguments_[index].mem) = argument;
   }
 
-  // Retrieves the actual address of an string argument. When using
+  // Retrieves the actual address of a string argument. When using
   // GetArgument() to retrieve an index that contains a string, the returned
   // value is just an offset to the actual string.
   // index: the stored string index. Valid values are from 0
diff --git a/third_party/blink/renderer/platform/wtf/text/string_view.h b/third_party/blink/renderer/platform/wtf/text/string_view.h
index b63a49ba9ba118..74885f0abcba4e 100644
--- a/third_party/blink/renderer/platform/wtf/text/string_view.h
+++ b/third_party/blink/renderer/platform/wtf/text/string_view.h
@@ -57,7 +57,7 @@ class WTF_EXPORT StringView {
   StringView(StringImpl&, unsigned offset);
   StringView(StringImpl&, unsigned offset, unsigned length);
 
-  // From an String, implemented in String.h
+  // From a String, implemented in String.h
   inline StringView(const String&, unsigned offset, unsigned length);
   inline StringView(const String&, unsigned offset);
   inline StringView(const String&);