The 2021 Inter-Provincial Trophy was the ninth edition of the Inter-Provincial Trophy, a Twenty20 cricket competition that was played in Ireland in 2021. It was the fifth edition of the competition to be played with full Twenty20 status. The tournament was played as a series of three-day festivals between four teams. On 25 March 2021, Cricket Ireland confirmed the fixtures for the tournament. On 9 April 2021, Cricket Ireland announced the revised fixtures for the tournament, with number of matches increased from 12 to 18. Leinster Lightning were the defending champions.