A by-thirds Hyndburn Borough Council local election (postponed since March 2020, due to the Coronavirus outbreak), was held on Thursday 6 May 2021. Approximately one third of the local council's 35 seats fall up for election on that day. This election, postponed for 12-months since 2020, took place at the same time as the regularly-scheduled 2021 Lancashire County Council elections and the rescheduled Lancashire Police & Crime Commissioner elections.