diff --git a/src/js/_enqueues/wp/customize/controls.js b/src/js/_enqueues/wp/customize/controls.js
index c8ee3de8df..0496435e42 100644
--- a/src/js/_enqueues/wp/customize/controls.js
+++ b/src/js/_enqueues/wp/customize/controls.js
@@ -6,6 +6,12 @@
 (function( exports, $ ){
 	var Container, focus, normalizedTransitionendEventName, api = wp.customize;
 
+	var reducedMotionMediaQuery = window.matchMedia( '(prefers-reduced-motion: reduce)' );
+	var isReducedMotion = reducedMotionMediaQuery.matches;
+	reducedMotionMediaQuery.addEventListener( 'change' , function handleReducedMotionChange( event ) {
+		isReducedMotion = event.matches;
+	});
+
 	api.OverlayNotification = api.Notification.extend(/** @lends wp.customize.OverlayNotification.prototype */{
 
 		/**
@@ -1264,11 +1270,14 @@
 		 * @return {void}
 		 */
 		_animateChangeExpanded: function( completeCallback ) {
-			// Return if CSS transitions are not supported.
-			if ( ! normalizedTransitionendEventName ) {
-				if ( completeCallback ) {
-					completeCallback();
-				}
+			// Return if CSS transitions are not supported or if reduced motion is enabled.
+			if ( ! normalizedTransitionendEventName || isReducedMotion ) {
+				// Schedule the callback until the next tick to prevent focus loss.
+				_.defer( function () {
+					if ( completeCallback ) {
+						completeCallback();
+					}
+				} );
 				return;
 			}
 
diff --git a/src/wp-admin/css/customize-controls.css b/src/wp-admin/css/customize-controls.css
index 7685073d9a..7e50a59bb5 100644
--- a/src/wp-admin/css/customize-controls.css
+++ b/src/wp-admin/css/customize-controls.css
@@ -105,6 +105,12 @@ body:not(.ready) #customize-save-button-wrapper .save {
 	height: 100%;
 }
 
+@media (prefers-reduced-motion: reduce) {
+	#customize-sidebar-outer-content {
+		transition: none;
+	}
+}
+
 #customize-theme-controls .control-section-outer {
 	display: none !important;
 }
@@ -123,6 +129,12 @@ body:not(.ready) #customize-save-button-wrapper .save {
 	transition: left .18s;
 }
 
+@media (prefers-reduced-motion: reduce) {
+	.outer-section-open .wp-full-overlay.expanded #customize-sidebar-outer-content {
+		transition: none;
+	}
+}
+
 .customize-outer-pane-parent {
 	margin: 0;
 }
@@ -537,6 +549,13 @@ body.trashing #publish-settings {
 		.15s border-color ease-in-out;
 }
 
+@media (prefers-reduced-motion: reduce) {
+	#customize-theme-controls .accordion-section-title,
+	#customize-outer-theme-controls .accordion-section-title {
+		transition: none;
+	}
+}
+
 #customize-controls #customize-theme-controls .customize-themes-panel .accordion-section-title {
 	color: #50575e;
 	background-color: #fff;
@@ -635,6 +654,14 @@ body.trashing #publish-settings {
 	transition: 0.18s transform cubic-bezier(0.645, 0.045, 0.355, 1); /* easeInOutCubic */
 }
 
+@media (prefers-reduced-motion: reduce) {
+	#customize-info,
+	#customize-theme-controls .customize-pane-parent,
+	#customize-theme-controls .customize-pane-child {
+		transition: none;
+	}
+}
+
 #customize-theme-controls .customize-pane-child.skip-transition {
 	transition: none;
 }
@@ -1723,6 +1750,12 @@ p.customize-section-description {
 	z-index: 20;
 }
 
+@media (prefers-reduced-motion: reduce) {
+	.control-panel-themes .customize-themes-full-container {
+		transition: none;
+	}
+}
+
 @media screen and (min-width: 1670px) {
 	.control-panel-themes .customize-themes-full-container {
 		width: 82%;