diff --git a/src/wp-admin/css/login.css b/src/wp-admin/css/login.css
index 3c795ebab5..750698591f 100644
--- a/src/wp-admin/css/login.css
+++ b/src/wp-admin/css/login.css
@@ -281,7 +281,7 @@ p {
 
 #login {
 	width: 320px;
-	padding: 8% 0 0;
+	padding: 5% 0 0;
 	margin: auto;
 }
 
@@ -321,7 +321,7 @@ p {
 .login .privacy-policy-page-link {
 	text-align: center;
 	width: 100%;
-	margin: 5em 0 2em;
+	margin: 3em 0 2em;
 }
 
 .login form .input,
@@ -409,10 +409,46 @@ input::-ms-reveal {
 	display: none;
 }
 
+#language-switcher {
+	padding: 0;
+	overflow: visible;
+	background: none;
+	border: none;
+	box-shadow: none;
+}
+
+#language-switcher select {
+	margin-right: 0.25em;
+}
+
+.language-switcher {
+	margin: 0 auto;
+	padding: 0 0 24px;
+	text-align: center;
+}
+
+.language-switcher label {
+	margin-right: 0.25em;
+}
+
+.language-switcher label .dashicons {
+	width: auto;
+	height: auto;
+}
+
+.login .language-switcher .button-primary {
+	float: none;
+	margin-bottom: 0;
+}
+
 @media screen and (max-height: 550px) {
 	#login {
 		padding: 20px 0;
 	}
+
+	#language-switcher {
+		margin-top: 0;
+	}
 }
 
 
@@ -427,4 +463,16 @@ input::-ms-reveal {
 		height: 1.3125rem;
 		margin: -0.1875rem 0 0 -0.25rem;
 	}
+
+	#language-switcher label,
+	#language-switcher select {
+		margin-right: 0;
+	}
+}
+
+@media screen and (max-width: 400px) {
+	.login .language-switcher .button-primary {
+		display: block;
+		margin: 5px auto 0;
+	}
 }
diff --git a/src/wp-includes/l10n.php b/src/wp-includes/l10n.php
index 8347c226fa..b2810a6eb5 100644
--- a/src/wp-includes/l10n.php
+++ b/src/wp-includes/l10n.php
@@ -144,8 +144,16 @@ function determine_locale() {
 		$determined_locale = get_user_locale();
 	}
 
-	if ( ! empty( $_GET['wp_lang'] ) && ! empty( $GLOBALS['pagenow'] ) && 'wp-login.php' === $GLOBALS['pagenow'] ) {
-		$determined_locale = sanitize_text_field( $_GET['wp_lang'] );
+	$wp_lang = '';
+
+	if ( ! empty( $_GET['wp_lang'] ) ) {
+		$wp_lang = sanitize_text_field( $_GET['wp_lang'] );
+	} elseif ( ! empty( $_COOKIE['wp_lang'] ) ) {
+		$wp_lang = sanitize_text_field( $_COOKIE['wp_lang'] );
+	}
+
+	if ( ! empty( $wp_lang ) && ! empty( $GLOBALS['pagenow'] ) && 'wp-login.php' === $GLOBALS['pagenow'] ) {
+		$determined_locale = $wp_lang;
 	}
 
 	/**
@@ -1480,6 +1488,7 @@ function wp_get_pomo_file_data( $po_file ) {
  * @since 4.3.0 Introduced the `echo` argument.
  * @since 4.7.0 Introduced the `show_option_site_default` argument.
  * @since 5.1.0 Introduced the `show_option_en_us` argument.
+ * @since 5.9.0 Introduced the `explicit_option_en_us` argument.
  *
  * @see get_available_languages()
  * @see wp_get_available_translations()
@@ -1499,6 +1508,8 @@ function wp_get_pomo_file_data( $po_file ) {
  *     @type bool     $show_available_translations  Whether to show available translations. Default true.
  *     @type bool     $show_option_site_default     Whether to show an option to fall back to the site's locale. Default false.
  *     @type bool     $show_option_en_us            Whether to show an option for English (United States). Default true.
+ *     @type bool     $explicit_option_en_us        Whether the English (United States) option uses an explict value of en_US
+ *                                                  instead of an empty value. Default false.
  * }
  * @return string HTML dropdown list of languages.
  */
@@ -1516,6 +1527,7 @@ function wp_dropdown_languages( $args = array() ) {
 			'show_available_translations' => true,
 			'show_option_site_default'    => false,
 			'show_option_en_us'           => true,
+			'explicit_option_en_us'       => false,
 		)
 	);
 
@@ -1525,7 +1537,7 @@ function wp_dropdown_languages( $args = array() ) {
 	}
 
 	// English (United States) uses an empty string for the value attribute.
-	if ( 'en_US' === $parsed_args['selected'] ) {
+	if ( 'en_US' === $parsed_args['selected'] && ! $parsed_args['explicit_option_en_us'] ) {
 		$parsed_args['selected'] = '';
 	}
 
@@ -1580,8 +1592,10 @@ function wp_dropdown_languages( $args = array() ) {
 	}
 
 	if ( $parsed_args['show_option_en_us'] ) {
+		$value = ( $parsed_args['explicit_option_en_us'] ) ? 'en_US' : '';
 		$structure[] = sprintf(
-			'<option value="" lang="en" data-installed="1"%s>English (United States)</option>',
+			'<option value="%s" lang="en" data-installed="1"%s>English (United States)</option>',
+			esc_attr( $value ),
 			selected( '', $parsed_args['selected'], false )
 		);
 	}
diff --git a/src/wp-includes/user.php b/src/wp-includes/user.php
index 018c960c03..328287da4c 100644
--- a/src/wp-includes/user.php
+++ b/src/wp-includes/user.php
@@ -3044,6 +3044,13 @@ function register_new_user( $user_login, $user_email ) {
 
 	update_user_meta( $user_id, 'default_password_nag', true ); // Set up the password change nag.
 
+	if ( ! empty( $_COOKIE['wp_lang'] ) ) {
+		$wp_lang = sanitize_text_field( $_COOKIE['wp_lang'] );
+		if ( in_array( $wp_lang, get_available_languages(), true ) ) {
+			update_user_meta( $user_id, 'locale', $wp_lang ); // Set user locale if defined on registration.
+		}
+ 	}
+
 	/**
 	 * Fires after a new user registration has been recorded.
 	 *
diff --git a/src/wp-login.php b/src/wp-login.php
index b7c14b4c83..4aa06cc99b 100644
--- a/src/wp-login.php
+++ b/src/wp-login.php
@@ -311,6 +311,58 @@ function login_footer( $input_id = '' ) {
 	?>
 	</div><?php // End of <div id="login">. ?>
 
+	<?php
+	$languages = get_available_languages();
+
+	if ( ! empty( $languages ) && ! $interim_login ) { ?>
+
+		<div class="language-switcher">
+			<form id="language-switcher" action="" method="get">
+
+				<label for="language-switcher-locales">
+					<span class="dashicons dashicons-translation" aria-hidden="true"></span>
+					<span class="screen-reader-text"><?php _e( 'Language' ); ?></span>
+				</label>
+
+				<?php
+					$args = array(
+						'id'                          => 'language-switcher-locales',
+						'name'                        => 'wp_lang',
+						'selected'                    => determine_locale(),
+						'show_available_translations' => false,
+						'explicit_option_en_us'       => true,
+						'languages'                   => $languages,
+					);
+
+					/**
+					 * Filters default arguments for the Languages select input on the login screen.
+					 *
+					 * @since 5.9.0
+					 *
+					 * @param array $args Arguments for the Languages select input on the login screen.
+					 */
+					wp_dropdown_languages( apply_filters( 'wp_login_language_switcher_args', $args ) );
+				?>
+
+				<?php if ( $interim_login ) { ?>
+					<input type="hidden" name="interim-login" value="1" />
+				<?php } ?>
+
+				<?php if ( isset( $_GET['redirect_to'] ) && '' !== $_GET['redirect_to'] ) { ?>
+					<input type="hidden" name="redirect_to" value="<?php echo esc_url_raw( $_GET['redirect_to'] ); ?>" />
+				<?php } ?>
+
+				<?php if ( isset( $_GET['action'] ) && '' !== $_GET['action'] ) { ?>
+					<input type="hidden" name="action" value="<?php echo esc_attr( $_GET['action'] ); ?>" />
+				<?php } ?>
+
+					<input type="submit" class="button button-primary" value="<?php esc_attr_e( 'Change' ); ?>">
+
+				</form>
+			</div>
+
+<?php } ?>
+
 	<?php
 
 	if ( ! empty( $input_id ) ) {
@@ -419,6 +471,10 @@ if ( SITECOOKIEPATH !== COOKIEPATH ) {
 	setcookie( TEST_COOKIE, 'WP Cookie check', 0, SITECOOKIEPATH, COOKIE_DOMAIN, $secure );
 }
 
+if ( isset( $_GET['wp_lang'] ) ) {
+	setcookie( 'wp_lang', sanitize_text_field( $_GET['wp_lang'] ), 0, COOKIEPATH, COOKIE_DOMAIN, $secure );
+}
+
 /**
  * Fires when the login form is initialized.
  *