diff --git a/fixtures/fiber-debugger/src/describeFibers.js b/fixtures/fiber-debugger/src/describeFibers.js
index cee652af65f1f..0e082f0b07e0c 100644
--- a/fixtures/fiber-debugger/src/describeFibers.js
+++ b/fixtures/fiber-debugger/src/describeFibers.js
@@ -90,17 +90,17 @@ export default function describeFibers(rootFiber, workInProgress) {
   const workInProgressID = acknowledgeFiber(workInProgress);
 
   let currentIDs = new Set();
-  function markAsCurent(id) {
+  function markAsCurrent(id) {
     currentIDs.add(id);
     const fiber = descriptions[id];
     if (fiber.sibling) {
-      markAsCurent(fiber.sibling);
+      markAsCurrent(fiber.sibling);
     }
     if (fiber.child) {
-      markAsCurent(fiber.child);
+      markAsCurrent(fiber.child);
     }
   }
-  markAsCurent(rootID);
+  markAsCurrent(rootID);
 
   return {
     descriptions,
diff --git a/packages/react-dom/src/__tests__/utils/ReactDOMServerIntegrationTestUtils.js b/packages/react-dom/src/__tests__/utils/ReactDOMServerIntegrationTestUtils.js
index d207a0faa1f6a..d45462e42c5b1 100644
--- a/packages/react-dom/src/__tests__/utils/ReactDOMServerIntegrationTestUtils.js
+++ b/packages/react-dom/src/__tests__/utils/ReactDOMServerIntegrationTestUtils.js
@@ -41,7 +41,7 @@ module.exports = function(initModules) {
     if (console.error.calls && console.error.calls.reset) {
       console.error.calls.reset();
     } else {
-      // TODO: Rewrite tests that use this helper to enumerate expeceted errors.
+      // TODO: Rewrite tests that use this helper to enumerate expected errors.
       // This will enable the helper to use the .toWarnDev() matcher instead of spying.
       spyOnDev(console, 'error');
     }
diff --git a/packages/react-dom/src/events/__tests__/ChangeEventPlugin-test.internal.js b/packages/react-dom/src/events/__tests__/ChangeEventPlugin-test.internal.js
index 36abb97b6e7fa..03d2cddeaaf84 100644
--- a/packages/react-dom/src/events/__tests__/ChangeEventPlugin-test.internal.js
+++ b/packages/react-dom/src/events/__tests__/ChangeEventPlugin-test.internal.js
@@ -661,7 +661,7 @@ describe('ChangeEventPlugin', () => {
                 type="text"
                 value={controlledValue}
                 onChange={() => {
-                  // Does nothing. Parent handler is reponsible for updating.
+                  // Does nothing. Parent handler is responsible for updating.
                 }}
               />
             </div>
diff --git a/packages/react-reconciler/src/__tests__/ReactIncremental-test.internal.js b/packages/react-reconciler/src/__tests__/ReactIncremental-test.internal.js
index 8a53360c7882f..69bd1dd0aa907 100644
--- a/packages/react-reconciler/src/__tests__/ReactIncremental-test.internal.js
+++ b/packages/react-reconciler/src/__tests__/ReactIncremental-test.internal.js
@@ -2430,7 +2430,7 @@ describe('ReactIncremental', () => {
     );
 
     // Trigger an update in the middle of the tree
-    // This is necessary to reproduce the error as it curently exists.
+    // This is necessary to reproduce the error as it currently exists.
     instance.setState({
       throwError: true,
     });
diff --git a/packages/react-reconciler/src/__tests__/ReactIncrementalErrorHandling-test.internal.js b/packages/react-reconciler/src/__tests__/ReactIncrementalErrorHandling-test.internal.js
index 079a570202ea9..43d2570c99f80 100644
--- a/packages/react-reconciler/src/__tests__/ReactIncrementalErrorHandling-test.internal.js
+++ b/packages/react-reconciler/src/__tests__/ReactIncrementalErrorHandling-test.internal.js
@@ -85,7 +85,7 @@ describe('ReactIncrementalErrorHandling', () => {
       </ErrorBoundary>,
     );
 
-    // Start rendering asynchronsouly
+    // Start rendering asynchronously
     ReactNoop.flushThrough([
       'ErrorBoundary (try)',
       'Indirection',
@@ -178,7 +178,7 @@ describe('ReactIncrementalErrorHandling', () => {
       </ErrorBoundary>,
     );
 
-    // Start rendering asynchronsouly
+    // Start rendering asynchronously
     ReactNoop.flushThrough([
       'ErrorBoundary (try)',
       'Indirection',
@@ -276,7 +276,7 @@ describe('ReactIncrementalErrorHandling', () => {
     // Schedule a low priority update to hide the child
     parent.current.setState({hideChild: true});
 
-    // Before the low priority update is flushed, synchronsouly trigger an
+    // Before the low priority update is flushed, synchronously trigger an
     // error in the child.
     ReactNoop.flushSync(() => {
       ReactNoop.render(<Parent ref={parent} childIsBroken={true} />);
diff --git a/packages/react/src/__tests__/ReactJSXElementValidator-test.js b/packages/react/src/__tests__/ReactJSXElementValidator-test.js
index 31831a29ac634..24fe79fdb1bf2 100644
--- a/packages/react/src/__tests__/ReactJSXElementValidator-test.js
+++ b/packages/react/src/__tests__/ReactJSXElementValidator-test.js
@@ -323,7 +323,7 @@ describe('ReactJSXElementValidator', () => {
     );
   });
 
-  it('should warn if getDefaultProps is specificed on the class', () => {
+  it('should warn if getDefaultProps is specified on the class', () => {
     class GetDefaultPropsComponent extends React.Component {
       render() {
         return <span>{this.props.prop}</span>;
diff --git a/packages/react/src/__tests__/ReactProfiler-test.internal.js b/packages/react/src/__tests__/ReactProfiler-test.internal.js
index 127d47ea216e3..b1593ff31c157 100644
--- a/packages/react/src/__tests__/ReactProfiler-test.internal.js
+++ b/packages/react/src/__tests__/ReactProfiler-test.internal.js
@@ -503,7 +503,7 @@ describe('Profiler', () => {
         });
 
         // Only call profile updates for paths that have re-rendered
-        // Since "inner" is beneath a pure compoent, it isn't called
+        // Since "inner" is beneath a pure component, it isn't called
         expect(callback).toHaveBeenCalledTimes(2);
         expect(callback.mock.calls[0][0]).toBe('middle');
         expect(callback.mock.calls[1][0]).toBe('outer');
@@ -667,7 +667,7 @@ describe('Profiler', () => {
           // Simulate time moving forward while frame is paused.
           advanceTimeBy(50); // 10 -> 60
 
-          // Flush the remaninig work,
+          // Flush the remaining work,
           // Which should take an additional 10ms of simulated time.
           expect(renderer).toFlushAndYield(['Yield:10', 'Yield:17']);
           expect(callback).toHaveBeenCalledTimes(2);
diff --git a/packages/shared/reactProdInvariant.js b/packages/shared/reactProdInvariant.js
index effc7f7409c81..482b2e342ef48 100644
--- a/packages/shared/reactProdInvariant.js
+++ b/packages/shared/reactProdInvariant.js
@@ -23,7 +23,7 @@ function reactProdInvariant(code: string): void {
   for (let argIdx = 0; argIdx < argCount; argIdx++) {
     url += '&args[]=' + encodeURIComponent(arguments[argIdx + 1]);
   }
-  // Rename it so that our build transform doesn't atttempt
+  // Rename it so that our build transform doesn't attempt
   // to replace this invariant() call with reactProdInvariant().
   const i = invariant;
   i(