A sea star is an echinoderm belonging to the class Asteroidea and otherwise known as a starfish.
Sea star or seastar may also refer to:
Sea Star Festival, summer music festival in Umag, Croatia AAC SeaStar, a two-seat biplane from Canada Dornier Seastar, an amphibious aircraft with two engines in a push-pull configuration MV Sea Star, a supertanker
Sea Star Awards, Argentine entertainment awards SeaStar, or OrbView-2, the satellite hosting the SeaWiFS instrument SeaStar, the communications processors in Cray XT3 and XT4 supercomputers Lockheed T2V SeaStar Sea Star (film), a Canadian short drama film