diff --git a/src/wp-admin/js/nav-menu.js b/src/wp-admin/js/nav-menu.js
index 264dc574fc..abff8f937f 100644
--- a/src/wp-admin/js/nav-menu.js
+++ b/src/wp-admin/js/nav-menu.js
@@ -43,6 +43,7 @@ var wpNavMenu;
 
 			this.attachQuickSearchListeners();
 			this.attachThemeLocationsListeners();
+			this.attachMenuSaveSubmitListeners();
 
 			this.attachTabsPanelListeners();
 
@@ -834,6 +835,30 @@ var wpNavMenu;
 			});
 		},
 
+		attachMenuSaveSubmitListeners : function() {
+			/*
+			 * When a navigation menu is saved, store a JSON representation of all form data
+			 * in a single input to avoid PHP `max_input_vars` limitations. See #14134.
+			 */
+			$('#update-nav-menu').submit(function() {
+				var navMenuData = {};
+				$('#update-nav-menu input').each(function(index, element) {
+					var name = $(element).attr('name');
+					var regex = /(.*)(?:\[(\d+)\])/;
+					if ( regex.test( name ) ) {
+						var matches = regex.exec(name);
+						if ( ! navMenuData[matches[1]] ) {
+							navMenuData[matches[1]] = [];
+						}
+						navMenuData[matches[1]][matches[2]] = $(element).val();
+					} else {
+						navMenuData[name] = $(element).val();
+					}
+				});
+				$('[name="nav-menu-data"]').val( JSON.stringify( navMenuData ) );
+			});
+		},
+
 		attachThemeLocationsListeners : function() {
 			var loc = $('#nav-menu-theme-locations'), params = {};
 			params.action = 'menu-locations-save';
diff --git a/src/wp-admin/nav-menus.php b/src/wp-admin/nav-menus.php
index 8f17e03031..deac6d2ca4 100644
--- a/src/wp-admin/nav-menus.php
+++ b/src/wp-admin/nav-menus.php
@@ -49,6 +49,19 @@ $num_locations = count( array_keys( $locations ) );
 // Allowed actions: add, update, delete
 $action = isset( $_REQUEST['action'] ) ? $_REQUEST['action'] : 'edit';
 
+/*
+ * If a JSON blob of navigation menu data is found, expand it and inject it
+ * into `$_POST` to avoid PHP `max_input_vars` limitations. See #14134.
+ */
+if ( isset( $_POST['nav-menu-data'] ) ) {
+	$data = json_decode( stripslashes( $_POST['nav-menu-data'] ) );
+	if ( ! is_null( $data ) && $data ) {
+		foreach ( $data as $post_var => $post_data ) {
+			$_POST[$post_var] = $post_data;
+		}
+	}
+}
+
 switch ( $action ) {
 	case 'add-menu-item':
 		check_admin_referer( 'add-menu_item', 'menu-settings-column-nonce' );
@@ -731,6 +744,7 @@ require_once( ABSPATH . 'wp-admin/admin-header.php' );
 		<div id="menu-management">
 			<form id="update-nav-menu" method="post" enctype="multipart/form-data">
 				<div class="menu-edit <?php if ( $add_new_screen ) echo 'blank-slate'; ?>">
+					<input type="hidden" name="nav-menu-data">
 					<?php
 					wp_nonce_field( 'closedpostboxes', 'closedpostboxesnonce', false );
 					wp_nonce_field( 'meta-box-order', 'meta-box-order-nonce', false );