diff --git wp-includes/class-wp-theme.php wp-includes/class-wp-theme.php
index 88e2275..4d10b9c 100644
--- wp-includes/class-wp-theme.php
+++ wp-includes/class-wp-theme.php
@@ -1482,6 +1482,82 @@ final class WP_Theme implements ArrayAccess {
 	}
 
 	/**
+	 * Enables a theme for a site.
+	 *
+	 * @since 5.0.0
+	 *
+	 * @param int $site_id Site ID.
+	 * @param string|string[] $stylesheets Stylesheet name or array of stylesheet names.
+	 */
+	public static function site_enable_theme( $site_id = null, $stylesheets ) {
+		if ( ! is_multisite() ) {
+			return;
+		}
+
+		if ( ! is_array( $stylesheets ) ) {
+			$stylesheets = array( $stylesheets );
+		}
+
+		$current_site_id = get_current_blog_id();
+		if ( ! $site_id ) {
+			$site_id = $current_site_id;
+		}
+
+		if ( $site_id !== $current_site_id ) {
+			switch_to_blog( $site_id );
+		}
+
+		$allowed_themes = get_option( 'allowedthemes' );
+		foreach ( $stylesheets as $stylesheet ) {
+			$allowed_themes[ $stylesheet ] = true;
+		}
+		update_option( 'allowedthemes', $allowed_themes );
+
+		if ( $site_id !== $current_site_id ) {
+			restore_current_blog();
+		}
+	}
+
+	/**
+	 * Disables a theme for a site.
+	 *
+	 * @since 5.0.0
+	 *
+	 * @param int $site_id Site ID.
+	 * @param string|string[] $stylesheets Stylesheet name or array of stylesheet names.
+	 */
+	public static function site_disable_theme( $site_id = null, $stylesheets ) {
+		if ( ! is_multisite() ) {
+			return;
+		}
+
+		if ( ! is_array( $stylesheets ) ) {
+			$stylesheets = array( $stylesheets );
+		}
+
+		$current_site_id = get_current_blog_id();
+		if ( ! $site_id ) {
+			$site_id = $current_site_id;
+		}
+
+		if ( $site_id !== $current_site_id ) {
+			switch_to_blog( $site_id );
+		}
+
+		$allowed_themes = get_option( 'allowedthemes' );
+		foreach ( $stylesheets as $stylesheet ) {
+			if ( isset( $allowed_themes[ $stylesheet ] ) ) {
+				unset( $allowed_themes[ $stylesheet ] );
+			}
+		}
+		update_option( 'allowedthemes', $allowed_themes );
+
+		if ( $site_id !== $current_site_id ) {
+			restore_current_blog();
+		}
+	}
+
+	/**
 	 * Enables a theme for all sites on the current network.
 	 *
 	 * @since 4.6.0