The 2021 Blackburn with Darwen Borough Council election took place on 6 May 2021 to elect members of Blackburn with Darwen Borough Council in England. This was on the same day as other local elections. One-third of the seats were up for election.
Prior to the election, the composition of the council was:
<span style="color:#FDBB30;">LD</span> - Liberal Democrat <br> <span style="color:grey;">Ind</span> - Independent politician
After the election, the composition of the council was:
<span style="color:grey;">Ind</span> - Independent politician