Kai Owen is a Welsh actor of stage and screen, known to Welsh audiences for his numerous roles on Welsh language television and to worldwide audiences for his portrayal of Rhys Williams in Torchwood and Pete Buchanan in Hollyoaks.

Rhys Alun Williams, portrayed by Kai Owen, is a fictional character in the BBC television programme Torchwood, a spin-off from the long-running series Doctor Who. The character is introduced in the premiere episode as the co-habiting boyfriend of the principal character Gwen Cooper. Initially a recurring character, Rhys' role is increased after the second series; actor Kai Owen is given star billing from the show's third series — a five-part serial subtitled Torchwood: Children of Earth — onwards. The character has gone on to appear in expanded universe material such as the Torchwood novels and audiobooks, comic books and radio plays.