Eifion "Jack" A. Davies (birth year unknown) is a Welsh former rugby union and professional rugby league footballer who played in the 1940s and 1950s. He played representative level rugby union (RU) for Wales XV and Middlesex, and at club level for London Welsh RFC, Richmond F.C. and Harlequin F.C., as a centre, i.e. number 12 or 13, and representative level rugby league (RL) for Wales, and at club level for Salford (Heritage No. 465), as a goal-kicking centre or usually stand-off, i.e. number 3 or 4, or 6.