Brian Alainu'uese (born 19 March 1994) is a professional rugby union player who plays as a lock for Top 14 club Toulon.

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

He got his big chance during the 2015 Super Rugby season when he was called up as a short-term injury replacement by the Chiefs and went on to make 2 appearances.

[3][4] On 24 October 2016 it was announced that he had signed for professional provincial team Glasgow Warriors in a deal to the end of the season.

[6] On 23 October 2018 Alainu'uese joined Toulon after being released from his Glasgow Warriors contract by mutual consent [7] Alainu'uese was considered too young to be selected for the 2013 IRB Junior World Championship by New Zealand and instead was called up by Samoa for whom he made 5 appearances and scored 1 try.