Ralph Walter Caulton (born 10 January 1937) is a former New Zealand rugby union player.
A wing, Caulton represented Wellington at a provincial level, and was a member of the New Zealand national side, the All Blacks, from 1959 to 1964.
He played 50 matches for the All Blacks including 16 internationals.
Later, he was a Marlborough selector in the 1970s, served on the committees of both the Wellington and New Zealand Rugby Unions, and in 1985 was coach of the national under-17 rugby team.