Clem Lewis (22 June 1890 – 27 October 1944) was a Welsh international fly-half who played club rugby for Cardiff.
Lewis was capped for Wales eleven times either side of World War I, and captained his country on two occasions.
The previous season, Wales had won the tournament, but Lewis was one of six new caps in the team who fell at the first hurdle, losing 8–0.
Although Lewis did not play in the remainder of the tournament he was back the next year scoring a try and a conversion in his second game against Scotland.
After serving in World War I, Lewis rejoined Cardiff and was recalled to the Welsh squad in 1921, and in 1923 captained the national team twice.