Mahaffey is a surname of Scottish origin, and is an Anglicisation of the Gaelic name Mac Dhuibhshithe.^[1] It is a sept of Clan Macfie in Scotland, but the clan originated in Ireland. There the name is found largely in County Donegal, Ulster.^[1]

People with the surname Mahaffey include:

• Art Mahaffey (born 1938), American athlete
• Audley F. Mahaffey (1899–1982), American politician
• Fred K. Mahaffey (1934–1986), American military officer
• Jim Mahaffey (1936–2020), American bridge player
• John Mahaffey (born 1948), American golfer
• Maryann Mahaffey (1925–2006), American politician
• Matt Mahaffey (born 1973), American musician
• Mike Mahaffey (1967–2005), American musician
• Randolph Mahaffey (born 1945), American basketball player
• Roy Mahaffey (1904–1969), American baseball player
• Valerie Mahaffey (born 1953), Indonesian-American actress