diff --git a/plugins/woocommerce/changelog/fix-36375-hpos-reserve-stock b/plugins/woocommerce/changelog/fix-36375-hpos-reserve-stock
new file mode 100644
index 00000000000..2c956bcfd0a
--- /dev/null
+++ b/plugins/woocommerce/changelog/fix-36375-hpos-reserve-stock
@@ -0,0 +1,4 @@
+Significance: patch
+Type: fix
+
+Add HPOS support to the reserved stock query
diff --git a/plugins/woocommerce/src/Checkout/Helpers/ReserveStock.php b/plugins/woocommerce/src/Checkout/Helpers/ReserveStock.php
index b164c895eb0..247e80a5255 100644
--- a/plugins/woocommerce/src/Checkout/Helpers/ReserveStock.php
+++ b/plugins/woocommerce/src/Checkout/Helpers/ReserveStock.php
@@ -5,6 +5,8 @@
 
 namespace Automattic\WooCommerce\Checkout\Helpers;
 
+use Automattic\WooCommerce\Utilities\OrderUtil;
+
 defined( 'ABSPATH' ) || exit;
 
 /**
@@ -202,11 +204,20 @@ final class ReserveStock {
 	 */
 	private function get_query_for_reserved_stock( $product_id, $exclude_order_id = 0 ) {
 		global $wpdb;
+
+		$join         = "$wpdb->posts posts ON stock_table.`order_id` = posts.ID";
+		$where_status = "posts.post_status IN ( 'wc-checkout-draft', 'wc-pending' )";
+		if ( OrderUtil::custom_orders_table_usage_is_enabled() ) {
+			$join         = "{$wpdb->prefix}wc_orders orders ON stock_table.`order_id` = orders.id";
+			$where_status = "orders.status IN ( 'wc-checkout-draft', 'wc-pending' )";
+		}
+
+		// phpcs:disable WordPress.DB.PreparedSQL.InterpolatedNotPrepared
 		$query = $wpdb->prepare(
 			"
 			SELECT COALESCE( SUM( stock_table.`stock_quantity` ), 0 ) FROM $wpdb->wc_reserved_stock stock_table
-			LEFT JOIN $wpdb->posts posts ON stock_table.`order_id` = posts.ID
-			WHERE posts.post_status IN ( 'wc-checkout-draft', 'wc-pending' )
+			LEFT JOIN $join
+			WHERE $where_status
 			AND stock_table.`expires` > NOW()
 			AND stock_table.`product_id` = %d
 			AND stock_table.`order_id` != %d
@@ -214,6 +225,7 @@ final class ReserveStock {
 			$product_id,
 			$exclude_order_id
 		);
+		// phpcs:enable WordPress.DB.PreparedSQL.InterpolatedNotPrepared
 
 		/**
 		 * Filter: woocommerce_query_for_reserved_stock