No, Top Fin does not have a lifetime warranty. Instead, they offer a 30-day satisfaction guarantee on all products purchased directly from the Top Fin website. If you're not completely satisfied with your purchase within 30 days of receipt, you can return it for a full refund or exchange. Additionally, most of the aquariums and filters that are sold by Top Fin come with a limited manufacturer's warranty which is typically valid for one year after purchase. Therefore, while there is no lifetime warranty offered by Top Fin itself, customers can take comfort in knowing that their purchases are backed up by limited warranties provided by the manufacturers themselves.