The 2021 Liga 3 Bali season (also known as the 2021 Bali United Liga 3 season for sponsorship reasons) was the sixth season of Liga 3 Bali as a qualifying round for the national round of the 2021–22 Liga 3. It began on 14 October and ended with a final on 15 December 2021. Perseden were the defending champion and they successfully defended their title following a 1–0 win against PS Jembrana in the final.