Bristol have completed the signings of Worcester Warriors flanker Chris Vui, Gloucester pair Mat Protheroe and Dan Thomas, and Sam Bedlow from Sale Sharks.
Samoa international Vui joined Warriors in December and has played eight times this season.
Full-back Protheroe and back-rower Thomas have made four and 15 appearances this term respectively.
Centre Bedlow came through the Sharks academy and has played in eight games.
“We’re delighted to beat off the interest of a number of other clubs to capture the signings of these gifted young players,” Head Coach Mark Tainton told bristolrugby.co.uk.
“Mat is a hugely exciting player with bags of natural talent. He’ll bring some flair and energy to our attacking game and – under the tutelage of Pat [Lam]’s attacking philosophy – we expect Mat to make a significant impact in a Bristol jersey.”
Bristol were relegated back to the Championship earlier this month after just one season in the Premiership.