diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8a0b85b5fb40..e62cd0e6a7e7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -65,6 +65,7 @@
 
 ### Chore & Maintenance
 
+- `[jest-watcher]` Standardize filenames ([#7314](https://github.com/facebook/jest/pull/7314))
 - `[jest-circus]` Standardize file naming in `jest-circus` ([#7301](https://github.com/facebook/jest/pull/7301))
 - `[docs]` Add synchronous test.each setup ([#7150](https://github.com/facebook/jest/pull/7150))
 - `[docs]` Add `this.extend` to the Custom Matchers API reference ([#7130](https://github.com/facebook/jest/pull/7130))
diff --git a/packages/jest-watcher/src/base_watch_plugin.js b/packages/jest-watcher/src/BaseWatchPlugin.js
similarity index 100%
rename from packages/jest-watcher/src/base_watch_plugin.js
rename to packages/jest-watcher/src/BaseWatchPlugin.js
diff --git a/packages/jest-watcher/src/jest_hooks.js b/packages/jest-watcher/src/JestHooks.js
similarity index 100%
rename from packages/jest-watcher/src/jest_hooks.js
rename to packages/jest-watcher/src/JestHooks.js
diff --git a/packages/jest-watcher/src/pattern_prompt.js b/packages/jest-watcher/src/PatternPrompt.js
similarity index 100%
rename from packages/jest-watcher/src/pattern_prompt.js
rename to packages/jest-watcher/src/PatternPrompt.js
diff --git a/packages/jest-watcher/src/index.js b/packages/jest-watcher/src/index.js
index fbe13be62b2c..ec145efba3bd 100644
--- a/packages/jest-watcher/src/index.js
+++ b/packages/jest-watcher/src/index.js
@@ -7,9 +7,9 @@
  * @flow
  */
 
-export {default as BaseWatchPlugin} from './base_watch_plugin';
-export {default as JestHook} from './jest_hooks';
-export {default as PatternPrompt} from './pattern_prompt';
+export {default as BaseWatchPlugin} from './BaseWatchPlugin';
+export {default as JestHook} from './JestHooks';
+export {default as PatternPrompt} from './PatternPrompt';
 export * from './constants';
 export {default as Prompt} from './lib/Prompt';
-export * from './lib/pattern_mode_helpers';
+export * from './lib/patternModeHelpers';
diff --git a/packages/jest-watcher/src/lib/__tests__/__snapshots__/format_test_name_by_pattern.test.js.snap b/packages/jest-watcher/src/lib/__tests__/__snapshots__/formatTestNameByPattern.test.js.snap
similarity index 100%
rename from packages/jest-watcher/src/lib/__tests__/__snapshots__/format_test_name_by_pattern.test.js.snap
rename to packages/jest-watcher/src/lib/__tests__/__snapshots__/formatTestNameByPattern.test.js.snap
diff --git a/packages/jest-watcher/src/lib/__tests__/format_test_name_by_pattern.test.js b/packages/jest-watcher/src/lib/__tests__/formatTestNameByPattern.test.js
similarity index 97%
rename from packages/jest-watcher/src/lib/__tests__/format_test_name_by_pattern.test.js
rename to packages/jest-watcher/src/lib/__tests__/formatTestNameByPattern.test.js
index 08b688f77aae..16bea7d02681 100644
--- a/packages/jest-watcher/src/lib/__tests__/format_test_name_by_pattern.test.js
+++ b/packages/jest-watcher/src/lib/__tests__/formatTestNameByPattern.test.js
@@ -9,7 +9,7 @@
 
 'use strict';
 
-import formatTestNameByPattern from '../format_test_name_by_pattern';
+import formatTestNameByPattern from '../formatTestNameByPattern';
 
 describe('for multiline test name returns', () => {
   const testNames = [
diff --git a/packages/jest-watcher/src/lib/__tests__/scroll_list.test.js b/packages/jest-watcher/src/lib/__tests__/scroll.test.js
similarity index 97%
rename from packages/jest-watcher/src/lib/__tests__/scroll_list.test.js
rename to packages/jest-watcher/src/lib/__tests__/scroll.test.js
index c63a357cb3f6..171e5c98b03e 100644
--- a/packages/jest-watcher/src/lib/__tests__/scroll_list.test.js
+++ b/packages/jest-watcher/src/lib/__tests__/scroll.test.js
@@ -1,6 +1,6 @@
 // Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
 
-import scroll from '../scroll_list';
+import scroll from '../scroll';
 
 it('When offset is -1', () => {
   expect(scroll(25, {max: 10, offset: -1})).toEqual({
diff --git a/packages/jest-watcher/src/lib/format_test_name_by_pattern.js b/packages/jest-watcher/src/lib/formatTestNameByPattern.js
similarity index 100%
rename from packages/jest-watcher/src/lib/format_test_name_by_pattern.js
rename to packages/jest-watcher/src/lib/formatTestNameByPattern.js
diff --git a/packages/jest-watcher/src/lib/pattern_mode_helpers.js b/packages/jest-watcher/src/lib/patternModeHelpers.js
similarity index 100%
rename from packages/jest-watcher/src/lib/pattern_mode_helpers.js
rename to packages/jest-watcher/src/lib/patternModeHelpers.js
diff --git a/packages/jest-watcher/src/lib/scroll_list.js b/packages/jest-watcher/src/lib/scroll.js
similarity index 100%
rename from packages/jest-watcher/src/lib/scroll_list.js
rename to packages/jest-watcher/src/lib/scroll.js