diff --git a/src/wp-activate.php b/src/wp-activate.php
index 7b7ef3498c..0fb0eaecf8 100644
--- a/src/wp-activate.php
+++ b/src/wp-activate.php
@@ -14,7 +14,7 @@ require( dirname(__FILE__) . '/wp-load.php' );
 require( dirname( __FILE__ ) . '/wp-blog-header.php' );
 
 if ( !is_multisite() ) {
-	wp_redirect( site_url( '/wp-login.php?action=register' ) );
+	wp_redirect( wp_registration_url() );
 	die();
 }
 
diff --git a/src/wp-admin/includes/network.php b/src/wp-admin/includes/network.php
index b47d831656..13004494f7 100644
--- a/src/wp-admin/includes/network.php
+++ b/src/wp-admin/includes/network.php
@@ -494,7 +494,7 @@ EOF;
 	<?php endif; // end IIS/Apache code branches.
 
 	if ( !is_multisite() ) { ?>
-		<p><?php _e( 'Once you complete these steps, your network is enabled and configured. You will have to log in again.' ); ?> <a href="<?php echo esc_url( site_url( 'wp-login.php' ) ); ?>"><?php _e( 'Log In' ); ?></a></p>
+		<p><?php _e( 'Once you complete these steps, your network is enabled and configured. You will have to log in again.' ); ?> <a href="<?php echo esc_url( wp_login_url() ); ?>"><?php _e( 'Log In' ); ?></a></p>
 <?php
 	}
 }
\ No newline at end of file
diff --git a/src/wp-includes/canonical.php b/src/wp-includes/canonical.php
index 4caaa656fe..4c981f9a38 100644
--- a/src/wp-includes/canonical.php
+++ b/src/wp-includes/canonical.php
@@ -326,7 +326,7 @@ function redirect_canonical( $requested_url = null, $do_redirect = true ) {
 				/** This filter is documented in wp-login.php */
 				$redirect_url = apply_filters( 'wp_signup_location', network_site_url( 'wp-signup.php' ) );
 			} else {
-				$redirect_url = site_url( 'wp-login.php?action=register' );
+				$redirect_url = wp_registration_url();
 			}
 
 			wp_redirect( $redirect_url, 301 );
@@ -591,7 +591,7 @@ function wp_redirect_admin_locations() {
 		site_url( 'login', 'relative' ),
 	);
 	if ( in_array( untrailingslashit( $_SERVER['REQUEST_URI'] ), $logins ) ) {
-		wp_redirect( site_url( 'wp-login.php', 'login' ) );
+		wp_redirect( wp_login_url() );
 		exit;
 	}
 }
diff --git a/src/wp-includes/general-template.php b/src/wp-includes/general-template.php
index f73d57aae4..021f501eb5 100644
--- a/src/wp-includes/general-template.php
+++ b/src/wp-includes/general-template.php
@@ -447,7 +447,7 @@ function wp_login_form( $args = array() ) {
 	$login_form_bottom = apply_filters( 'login_form_bottom', '', $args );
 
 	$form = '
-		<form name="' . $args['form_id'] . '" id="' . $args['form_id'] . '" action="' . esc_url( site_url( 'wp-login.php', 'login_post' ) ) . '" method="post">
+		<form name="' . $args['form_id'] . '" id="' . $args['form_id'] . '" action="' . esc_url( wp_login_url() ) . '" method="post">
 			' . $login_form_top . '
 			<p class="login-username">
 				<label for="' . esc_attr( $args['id_username'] ) . '">' . esc_html( $args['label_username'] ) . '</label>
diff --git a/src/wp-login.php b/src/wp-login.php
index 9963a22e6a..9167bf8ef9 100644
--- a/src/wp-login.php
+++ b/src/wp-login.php
@@ -742,7 +742,7 @@ case 'register' :
 	login_header(__('Registration Form'), '<p class="message register">' . __('Register For This Site') . '</p>', $errors);
 ?>
 
-<form name="registerform" id="registerform" action="<?php echo esc_url( site_url('wp-login.php?action=register', 'login_post') ); ?>" method="post" novalidate="novalidate">
+<form name="registerform" id="registerform" action="<?php echo esc_url( wp_registration_url() ); ?>" method="post" novalidate="novalidate">
 	<p>
 		<label for="user_login"><?php _e('Username') ?><br />
 		<input type="text" name="user_login" id="user_login" class="input" value="<?php echo esc_attr(wp_unslash($user_login)); ?>" size="20" /></label>
@@ -908,7 +908,7 @@ default:
 	}
 ?>
 
-<form name="loginform" id="loginform" action="<?php echo esc_url( site_url( 'wp-login.php', 'login_post' ) ); ?>" method="post">
+<form name="loginform" id="loginform" action="<?php echo esc_url( wp_login_url() ); ?>" method="post">
 	<p>
 		<label for="user_login"><?php _e('Username') ?><br />
 		<input type="text" name="log" id="user_login"<?php echo $aria_describedby_error; ?> class="input" value="<?php echo esc_attr( $user_login ); ?>" size="20" /></label>
diff --git a/src/wp-signup.php b/src/wp-signup.php
index 2729132099..fa88ba9e8d 100644
--- a/src/wp-signup.php
+++ b/src/wp-signup.php
@@ -28,7 +28,7 @@ function do_signup_header() {
 add_action( 'wp_head', 'do_signup_header' );
 
 if ( !is_multisite() ) {
-	wp_redirect( site_url('wp-login.php?action=register') );
+	wp_redirect( wp_registration_url() );
 	die();
 }
 
@@ -669,7 +669,7 @@ $current_user = wp_get_current_user();
 if ( $active_signup == 'none' ) {
 	_e( 'Registration has been disabled.' );
 } elseif ( $active_signup == 'blog' && !is_user_logged_in() ) {
-	$login_url = site_url( 'wp-login.php?redirect_to=' . urlencode( network_site_url( 'wp-signup.php' ) ) );
+	$login_url = wp_login_url( network_site_url( 'wp-signup.php' ) );
 	echo sprintf( __( 'You must first <a href="%s">log in</a>, and then you can create a new site.' ), $login_url );
 } else {
 	$stage = isset( $_POST['stage'] ) ?  $_POST['stage'] : 'default';