Ramanantsoa is a Malagasy surname. Notable people with the surname include:
Bernard Ramanantsoa (born 1948), French school dean Gabriel Ramanantsoa (1906-1979), eighth prime minister of Madagascar Tsilavina Ramanantsoa (born 1992), Malagasy swimmer Tsimisotry Ramanantsoa (fl. 2007-present), Malagasy politician