Douglas John Warlow (born 13 February 1939) is a Welsh former dual-code international rugby union, and professional rugby league footballer who played in the 1960s and 1970s. He played representative level rugby union (RU) for Wales, and at club level for Felinfoel RFC and Llanelli RFC, as a prop, i.e. number 1 or 3, and representative level rugby league (RL) for Great Britain, and at club level for St. Helens (two spells), Widnes and the Rochdale Hornets, as a prop or second-row, i.e. number 8 or 10, or 11 or 12, during the era of contested scrums.