diff --git a/lib/experimental/editor-settings.php b/lib/experimental/editor-settings.php
index 126382f85a513e..88611e77544bec 100644
--- a/lib/experimental/editor-settings.php
+++ b/lib/experimental/editor-settings.php
@@ -34,6 +34,9 @@ function gutenberg_enable_experiments() {
 	if ( $gutenberg_experiments && array_key_exists( 'gutenberg-media-processing', $gutenberg_experiments ) ) {
 		wp_add_inline_script( 'wp-block-editor', 'window.__experimentalMediaProcessing = true', 'before' );
 	}
+	if ( $gutenberg_experiments && array_key_exists( 'gutenberg-search-query-block', $gutenberg_experiments ) ) {
+		wp_add_inline_script( 'wp-block-editor', 'window.__experimentalSearchQueryBlock = true', 'before' );
+	}
 }
 
 add_action( 'admin_init', 'gutenberg_enable_experiments' );
diff --git a/lib/experiments-page.php b/lib/experiments-page.php
index 27a54b920f4d52..9de707fb0d2db0 100644
--- a/lib/experiments-page.php
+++ b/lib/experiments-page.php
@@ -175,6 +175,18 @@ function gutenberg_initialize_experiments_settings() {
 		)
 	);
 
+	add_settings_field(
+		'gutenberg-search-query-block',
+		__( 'Instant Search and Query Block', 'gutenberg' ),
+		'gutenberg_display_experiment_field',
+		'gutenberg-experiments',
+		'gutenberg_experiments_section',
+		array(
+			'label' => __( 'Enable instant search functionality of the Search + Query blocks.', 'gutenberg' ),
+			'id'    => 'gutenberg-search-query-block',
+		)
+	);
+
 	register_setting(
 		'gutenberg-experiments',
 		'gutenberg-experiments'
diff --git a/packages/block-library/src/post-template/index.php b/packages/block-library/src/post-template/index.php
index 9126355c096a57..691fa0ec90f1b1 100644
--- a/packages/block-library/src/post-template/index.php
+++ b/packages/block-library/src/post-template/index.php
@@ -50,6 +50,11 @@ function render_block_core_post_template( $attributes, $content, $block ) {
 	$page_key            = isset( $block->context['queryId'] ) ? 'query-' . $block->context['queryId'] . '-page' : 'query-page';
 	$enhanced_pagination = isset( $block->context['enhancedPagination'] ) && $block->context['enhancedPagination'];
 	$page                = empty( $_GET[ $page_key ] ) ? 1 : (int) $_GET[ $page_key ];
+	$search_query        = empty( $_GET['search'] ) ? '' : sanitize_text_field( $_GET['search'] );
+
+	// Check if the Instant Search experiment is enabled.
+	$gutenberg_experiments  = get_option( 'gutenberg-experiments' );
+	$instant_search_enabled = isset( $gutenberg_experiments['gutenberg-search-query-block'] ) && $gutenberg_experiments['gutenberg-search-query-block'];
 
 	// Use global query if needed.
 	$use_global_query = ( isset( $block->context['query']['inherit'] ) && $block->context['query']['inherit'] );
@@ -64,12 +69,29 @@ function render_block_core_post_template( $attributes, $content, $block ) {
 		if ( in_the_loop() ) {
 			$query = clone $wp_query;
 			$query->rewind_posts();
+			$query_args = $wp_query->query_vars;
+
+			// Add search parameter if it exists.
+			if ( $enhanced_pagination && $instant_search_enabled && ! empty( $search_query ) ) {
+				$query_args['s'] = $search_query;
+			}
+			$query->query( $query_args );
 		} else {
+			// The query has not been run yet, modify the global query.
+			if ( $enhanced_pagination && $instant_search_enabled && ! empty( $search_query ) ) {
+				$wp_query->set( 's', $search_query );
+			}
 			$query = $wp_query;
 		}
 	} else {
 		$query_args = build_query_vars_from_query_block( $block, $page );
-		$query      = new WP_Query( $query_args );
+
+		// Add search parameter if enhanced pagination is on and search query exists
+		if ( $enhanced_pagination && $instant_search_enabled && ! empty( $search_query ) ) {
+			$query_args['s'] = $search_query;
+		}
+
+		$query = new WP_Query( $query_args );
 	}
 
 	if ( ! $query->have_posts() ) {
diff --git a/packages/block-library/src/search/view.js b/packages/block-library/src/search/view.js
index c13f66cb99043b..dff0c5608a09fb 100644
--- a/packages/block-library/src/search/view.js
+++ b/packages/block-library/src/search/view.js
@@ -7,21 +7,6 @@ const isEmpty = ( obj ) =>
 	[ Object, Array ].includes( ( obj || {} ).constructor ) &&
 	! Object.entries( obj || {} ).length;
 
-const updateURL = async ( value, name ) => {
-	const url = new URL( window.location );
-	const { actions } = await import( '@wordpress/interactivity-router' );
-
-	if ( 's' === name ) {
-		if ( ! isEmpty( value ) ) {
-			url.searchParams.set( 'search', value );
-		} else {
-			url.searchParams.delete( 'search' );
-		}
-	}
-
-	await actions.navigate( `${ window.location.pathname }${ url.search }` );
-};
-
 const { state, actions } = store(
 	'core/search',
 	{
@@ -50,6 +35,10 @@ const { state, actions } = store(
 			},
 			get isSearchInputVisible() {
 				const ctx = getContext();
+
+				// `ctx.isSearchInputVisible` is a client-side-only context value, so
+				// if it's not set, it means that it's an initial page load, so we need
+				// to return the value of `ctx.isSearchInputInitiallyVisible`.
 				if ( typeof ctx.isSearchInputVisible === 'undefined' ) {
 					return ctx.isSearchInputInitiallyVisible;
 				}
@@ -101,12 +90,24 @@ const { state, actions } = store(
 					return;
 				}
 
+				const url = new URL( window.location );
+
 				if ( 's' === name ) {
 					state.search = value;
+					if ( ! isEmpty( value ) ) {
+						url.searchParams.set( 'search', value );
+					} else {
+						url.searchParams.delete( 'search' );
+					}
 				}
 
-				// If not, navigate to the new URL.
-				yield updateURL( value, name );
+				const { actions: routerActions } = yield import(
+					'@wordpress/interactivity-router'
+				);
+
+				routerActions.navigate(
+					`${ window.location.pathname }${ url.search }`
+				);
 			},
 		},
 	},