Philip David Llewellyn (born 12 May 1947) is a Welsh former rugby union international.
Llewellyn, born in Swansea, played for Swansea RFC and was a taller than average prop, described by his coach as a "forward in the modern New Zealand mould". Debuting in the 1973 Five Nations Championship, Llewellyn claimed five Wales caps during his career, which included a win over Australia in Cardiff. He also played for the Barbarians.