Fix is a surname. Notable people with the surname include:

• Bernd Fix (born 1962), German computer security expert
• George Fix (1939–2002), American mathematician
• Helen Fix (1922–2019), American politician
• Josh Fix, South African musician
• Lauren Fix, American automotive expert
• Limor Fix, Israeli electronic design automation engineer and executive
• Oliver Fix (born 1973), German slalom canoeist
• Paul Fix (1901–1983), American film and television character actor
• Théodore Fix (1800–1846), French economist