Krainer is a surname. Notable people with the surname include:
Adrian Krainer (snowboarder) (born 1992), Austrian snowboarder Adrian R. Krainer, Uruguayan-American biochemist and molecular geneticist Lore Krainer (1930–2020), Austrian actress, restaurateur, and cabaret singer-songwriter Marco Krainer (born 1981), Austrian chef
See also Rainer (surname)