Liam Norwell and brothers Jack and Matt Taylor have signed new contracts with Gloucestershire until 2017.
All three young bowlers came through the youth ranks and second XI at the Bristol club.
Seamer Norwell, 22, took 29 Division Two wickets this season, while off-spinner Jack Taylor, 22, took 18 in the one-day competitions.
Left-arm seamer Matt Taylor, 20, claimed 21 wickets in his first season of regular County Championship action.
Director of cricket John Bracewell said: "I am absolutely delighted to see three more of our talented young bowlers make long-term commitments to the club.
"I believe that they can contribute to a bowling attack, which is getting stronger by the year and can develop into the best in Division Two next season."