Query all posts which do not have tags assigned to them
Either use the tag_not_in parameter if you have the tag id and if not then you can use tax_query parameter like so: $tag_to_exclude=”example_tag”; $args = array( ‘posts_per_page’ => -1, ‘tax_query’ => array( array( ‘taxonomy’ => ‘post_tag’, ‘field’ => ‘slug’, ‘terms’ => array($tag_to_exclude), ‘operator’ => ‘NOT IN’, ) ); query_posts($args);