diff --git a/includes/specials/SpecialEditWatchlist.php b/includes/specials/SpecialEditWatchlist.php
index 57816eeeb4c..5f1c0398585 100644
--- a/includes/specials/SpecialEditWatchlist.php
+++ b/includes/specials/SpecialEditWatchlist.php
@@ -143,6 +143,7 @@ class SpecialEditWatchlist extends UnlistedSpecialPage {
 			'mediawiki.interface.helpers.styles',
 			'mediawiki.special'
 		] );
+		$out->addModules( [ 'mediawiki.special.watchlist' ] );
 
 		$mode = self::getMode( $this->getRequest(), $mode, self::EDIT_NORMAL );
 		$this->currentMode = $mode;
@@ -657,8 +658,11 @@ class SpecialEditWatchlist extends UnlistedSpecialPage {
 		$removed = [];
 
 		foreach ( $data as $titles ) {
-			$this->unwatchTitles( $titles );
-			$removed = array_merge( $removed, $titles );
+			// ignore the 'check all' checkbox, which is a boolean value
+			if ( is_array( $titles ) ) {
+				$this->unwatchTitles( $titles );
+				$removed = array_merge( $removed, $titles );
+			}
 		}
 
 		if ( count( $removed ) > 0 ) {
@@ -700,7 +704,16 @@ class SpecialEditWatchlist extends UnlistedSpecialPage {
 
 			// checkTitle can filter some options out, avoid empty sections
 			if ( count( $options ) > 0 ) {
+				// add a checkbox to select all entries in namespace
+				$fields['CheckAllNs' . $namespace] = [
+					'cssclass' => 'mw-watchlistedit-checkall',
+					'type' => 'check',
+					'section' => "ns$namespace",
+					'label' => $this->msg( 'watchlistedit-normal-check-all' )->text()
+				];
+
 				$fields['TitlesNs' . $namespace] = [
+					'cssclass' => 'mw-watchlistedit-check' . $namespace,
 					'class' => EditWatchlistCheckboxSeriesField::class,
 					'options' => $options,
 					'section' => "ns$namespace",
diff --git a/languages/i18n/en.json b/languages/i18n/en.json
index 9b0e42e500d..c58553826a5 100644
--- a/languages/i18n/en.json
+++ b/languages/i18n/en.json
@@ -3632,6 +3632,7 @@
 	"watchlistedit-normal-legend": "Remove titles from watchlist",
 	"watchlistedit-normal-explain": "Titles on your watchlist are shown below.\nTo remove a title, check the box next to it, and click \"{{int:Watchlistedit-normal-submit}}\".\nYou can also [[Special:EditWatchlist/raw|edit the raw list]].",
 	"watchlistedit-normal-submit": "Remove titles",
+	"watchlistedit-normal-check-all": "Check all",
 	"watchlistedit-normal-done": "{{PLURAL:$1|A single title was|$1 titles were}} removed from your watchlist:",
 	"watchlistedit-raw-title": "Edit raw watchlist",
 	"watchlistedit-raw-legend": "Edit raw watchlist",
diff --git a/languages/i18n/qqq.json b/languages/i18n/qqq.json
index a3698830bf0..13e67f54269 100644
--- a/languages/i18n/qqq.json
+++ b/languages/i18n/qqq.json
@@ -3879,6 +3879,7 @@
 	"lag-warn-normal": "Used as warning about replica lag. Parameters:\n* $1 - number of seconds\nSee also:\n* {{msg-mw|Lag-warn-high}}",
 	"lag-warn-high": "Used as warning about replica lag. Parameters:\n* $1 - number of seconds\nSee also:\n* {{msg-mw|Lag-warn-normal}}",
 	"editwatchlist-summary": "{{doc-specialpagesummary|editwatchlist}}",
+	"watchlistedit-normal-check-all": "Label for checkbox to select all items in a namespace",
 	"watchlistedit-normal-title": "Title of [[Special:Watchlist/edit|special page]].",
 	"watchlistedit-normal-legend": "Heading of dialogue box on [[Special:Watchlist/edit]]",
 	"watchlistedit-normal-explain": "An introduction/explanation about the [[Special:Watchlist/edit|normal edit watchlist function]].\n\nRefers to {{msg-mw|Watchlistedit-normal-submit}}.",
diff --git a/resources/Resources.php b/resources/Resources.php
index 682cc932dcc..89d6b941ae6 100644
--- a/resources/Resources.php
+++ b/resources/Resources.php
@@ -2321,6 +2321,7 @@ return [
 		'scripts' => [
 			'resources/src/mediawiki.special.watchlist/watchlist.js',
 			'resources/src/mediawiki.special.watchlist/visitedstatus.js',
+			'resources/src/mediawiki.special.watchlist/editwatchlist.js'
 		],
 		'messages' => [
 			'addedwatchtext',
@@ -2333,6 +2334,7 @@ return [
 			'tooltip-ca-unwatch-expiring-hours',
 			'watchlist-unwatch',
 			'watchlist-unwatch-undo',
+			'watchlistedit-normal-check-all'
 		],
 		'dependencies' => [
 			'mediawiki.api',
diff --git a/resources/src/mediawiki.special.watchlist/editwatchlist.js b/resources/src/mediawiki.special.watchlist/editwatchlist.js
new file mode 100644
index 00000000000..4148009295d
--- /dev/null
+++ b/resources/src/mediawiki.special.watchlist/editwatchlist.js
@@ -0,0 +1,18 @@
+/*!
+ * JavaScript for Special:EditWatchlist
+ */
+( function () {
+	$( function () {
+		var $checkAllCheckboxes = $( 'span.mw-watchlistedit-checkall' );
+
+		$checkAllCheckboxes.each( function ( index, el ) {
+			var checkbox = OO.ui.infuse( el );
+			checkbox.on( 'change', function ( e ) {
+				var status = e;
+				var namespace = checkbox.elementId.split( 'CheckAllNs' )[ 1 ];
+				var $itemsToCheck = $( '.mw-watchlistedit-check' + namespace ).find( 'input[type="checkbox"]' );
+				$itemsToCheck.prop( 'checked', status );
+			} );
+		} );
+	} );
+}() );