Stephenson Antonio Wallace (born November 11, 1982) is a former swimmer from Saint Vincent and the Grenadines, who specialized in sprint freestyle events. Wallace competed only in the men's 50 m freestyle at the 2000 Summer Olympics in Sydney. He received a ticket from FINA, under a Universality program, in an entry time of 29.58. He challenged six other swimmers in heat one, including 16-year-olds Wael Ghassan of Qatar and Hassan Mubah of the Maldives. Diving in with a 0.87-second deficit, Wallace scorched the field to post a fourth-seeded time and a lifetime best of 27.84. Wallace failed to advance into the semifinals, as he placed seventy-first overall out of 80 swimmers in the prelims.