Kellock is a surname. Notable people with the surname include:
Alastair Kellock (born 1981), Scottish rugby union player and administrator Billy Kellock (1889–1958), English football player and manager Billy Kellock (footballer, born 1954) (born 1954), Scottish footballer Brian Kellock (1962–2025), Scottish jazz pianist David Taylor Kellock (1913–1988), Australian stained glass artist Fiona Kellock (born 1948), Scottish swimmer Lindsay Kellock (born 1990), Canadian equestrian Roy Kellock (1893–1975), Canadian Supreme Court Justice Thomas Kellock (1923–1993), British judge and politician
See also: Alexander Kellock Brown (1849–1922), Scottish landscape painter William Kellock Brown (1856–1934), Scottish sculptor Killough (surname)