Wakame (ワカメ, wakame), Undaria pinnatifida, is a sea vegetable, or edible seaweed. It has a subtly sweet flavour and is most often served in soups and salads.

Sea-farmers have grown wakame in Japan since the Nara period. The Invasive Species Specialist Group has listed Undaria pinnatifida on its list of 100 worst globally invasive species.