Caleb Stan Ralph (born 10 September 1977 in Rotorua) is a New Zealand rugby union footballer. Ralph began his first-class career with Bay of Plenty, then moved to Auckland before heading to Canterbury. He started his Super Rugby career with the Chiefs in 1997, Blues (1998–99), Crusaders (2000–08) and a cameo role with the Queensland Reds (2011). He made his All Black debut while playing for Auckland in 1998.