diff --git a/js/common/view/LocaleSwitch.ts b/js/common/view/LocaleSwitch.ts
new file mode 100644
index 0000000..e3985bb
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+++ b/js/common/view/LocaleSwitch.ts
@@ -0,0 +1,78 @@
+// Copyright 2021-2023, University of Colorado Boulder
+
+/**
+ * An ABSwitch for choosing the primary or secondary locale.
+ *
+ * @author Chris Klusendorf (PhET Interactive Simulations)
+ */
+
+import Dimension2 from '../../../../dot/js/Dimension2.js';
+import PhetFont from '../../../../scenery-phet/js/PhetFont.js';
+import { Text } from '../../../../scenery/js/imports.js';
+import ABSwitch from '../../../../sun/js/ABSwitch.js';
+import localeProperty from '../../../../joist/js/i18n/localeProperty.js';
+import DerivedProperty from '../../../../axon/js/DerivedProperty.js';
+import StringUtils from '../../../../phetcommon/js/util/StringUtils.js';
+import NumberSuiteCommonPreferences from '../../../../number-suite-common/js/common/model/NumberSuiteCommonPreferences.js';
+import NumberSuiteCommonUtteranceQueue from '../../../../number-suite-common/js/common/view/NumberSuiteCommonUtteranceQueue.js';
+import numberPlay from '../../numberPlay.js';
+
+// constants
+const TOGGLE_SWITCH_SIZE = new Dimension2( 40, 20 );
+const SPACING = 8;
+const TEXT_OPTIONS = {
+  font: new PhetFont( 14 )
+};
+
+export default class LocaleSwitch extends ABSwitch<boolean> {
+
+  public constructor(
+    preferences: NumberSuiteCommonPreferences,
+    utteranceQueue: NumberSuiteCommonUtteranceQueue,
+    maxWidth: number
+  ) {
+
+    const firstLanguageStringProperty = new DerivedProperty( [ localeProperty ], StringUtils.localeToLocalizedName );
+
+    const secondLanguageStringProperty = new DerivedProperty( [ preferences.secondLocaleProperty ],
+      StringUtils.localeToLocalizedName );
+
+    const firstLanguageText = new Text( firstLanguageStringProperty, TEXT_OPTIONS );
+    const secondLanguageText = new Text( secondLanguageStringProperty, TEXT_OPTIONS );
+
+    super( preferences.isPrimaryLocaleProperty,
+      true, firstLanguageText,
+      false, secondLanguageText, {
+        spacing: SPACING,
+        toggleSwitchOptions: {
+          size: TOGGLE_SWITCH_SIZE
+        },
+        visibleProperty: new DerivedProperty( [ preferences.showSecondLocaleProperty ], showSecondLocale => showSecondLocale )
+      }
+    );
+
+    // Speak speechData if readAloud is turned on.
+    this.onInputEmitter.addListener( () => preferences.readAloudProperty.value && utteranceQueue.speakSpeechData() );
+
+    const availableTextSpace = maxWidth - TOGGLE_SWITCH_SIZE.width - SPACING * 2;
+    let isAdjusting = false; // to prevent recursion that will exceed maximum call stack size
+    this.boundsProperty.link( () => {
+      if ( !isAdjusting ) {
+        isAdjusting = true;
+
+        // Assume that neither label needs to be scaled.
+        firstLanguageText.maxWidth = null;
+        secondLanguageText.maxWidth = null;
+
+        // If there's not enough space for both full-size labels, give each Text label half of the available space.
+        if ( firstLanguageText.width + secondLanguageText.width > availableTextSpace ) {
+          firstLanguageText.maxWidth = availableTextSpace / 2;
+          secondLanguageText.maxWidth = availableTextSpace / 2;
+        }
+        isAdjusting = false;
+      }
+    } );
+  }
+}
+
+numberPlay.register( 'LocaleSwitch', LocaleSwitch );
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