The 2021 Halton Borough Council election took place on 6 May 2021 to elect all 54 members (reduced from 56 at the last elections) of the council due to a redrawing of boundaries. It was held on the same day as other local elections. Turnout was 25%.
Following the last election in 2019, the composition of the council was:
After the election, the composition of the council was:
<span style="color:#FAA61A;">LD</span> - Liberal Democrats <br/> <span style="color:#0087DC;">C</span> - Conservative <br/> <span style="color:#6AB023;">G</span> - Green Party