diff --git a/includes/class-core.php b/includes/class-core.php
index b6c96721..89162ec1 100644
--- a/includes/class-core.php
+++ b/includes/class-core.php
@@ -43,6 +43,7 @@ public function __construct() {
 		\add_action( 'enqueue_block_editor_assets', [ __CLASS__, 'editor_scripts' ] );
 		\add_filter( 'block_type_metadata', [ __CLASS__, 'block_variations' ] );
 		\add_action( 'init', [ __CLASS__, 'block_pattern_categories' ] );
+		\add_action( 'init', [ __CLASS__, 'register_block_styles' ] );
 	}
 
 	/**
@@ -148,6 +149,21 @@ public static function block_pattern_categories() {
 			)
 		);
 	}
+
+	/**
+	 * Register new block styles.
+	 *
+	 * @since Newspack Block Theme 1.0
+	 */
+	public static function register_block_styles() {
+		register_block_style(
+			'core/column',
+			array(
+				'name'  => 'rounded',
+				'label' => __( 'Rounded', 'newspack-block-theme' ),
+			)
+		);
+	}
 }
 
 Core::instance();
diff --git a/src/scss/block-styles/_block-styles.scss b/src/scss/block-styles/_block-styles.scss
index 72a25492..cce01e9b 100644
--- a/src/scss/block-styles/_block-styles.scss
+++ b/src/scss/block-styles/_block-styles.scss
@@ -1,2 +1,3 @@
+@import url('./_column-styles.scss');
 @import url('./_navigation-styles.scss');
 @import url('./_separator-styles.scss');
diff --git a/src/scss/block-styles/_column-styles.scss b/src/scss/block-styles/_column-styles.scss
new file mode 100644
index 00000000..fd0f9166
--- /dev/null
+++ b/src/scss/block-styles/_column-styles.scss
@@ -0,0 +1,5 @@
+.wp-block-column {
+	&.is-style-rounded {
+		border-radius: var( --wp--custom--border--radius-medium );
+	}
+}