Christopher Fatu Vui (born 11 February 1993) is a professional rugby union player who plays as a lock for Premiership Rugby club Bristol Bears.

Born in New Zealand, he represents Samoa at international level after qualifying on ancestry grounds.

During the 2015 Super Rugby season he made 2 appearances for the Auckland-based Blues franchise.

He represented New Zealand Under 20 in the 2013 IRB Junior World Championship in France.

Vui became the youngest captain in World Rugby when he skippered Samoa in 2017.