Old is a surname. Notable people with the surname include:
Alan Old (born 1945), English rugby union player Archie J. Old Jr. (1906–1984), United States Air Force officer Ashley George Old (1913–2001), British artist Ben Old (born 2002), New Zealand footballer Chris Old (born 1948), English cricketer Dick Old (1922–2007), Australian politician Francis Old (1875–1950), Australian politician
Hughes Oliphant Old (1933–2016), American theologian Lloyd J. Old (1933–2011), cancer researcher Richard Old (1856–1932), English woodcraftsman and model maker Steven Old (born 1986), New Zealand footballer William E. Old Jr. (1928–1982), American malacologist
See also Olde, a list of people with the surname Olds (surname)