The 2021 Sefton Metropolitan Borough Council election took place on 6 May 2021 to elect members of Sefton Council in England. This was on the same day as other local elections. One-third of the seats were up for election, with two wards (Blundellsands and Derby) electing two councillors.
The incumbent, Tony Dawson, was elected as a Liberal Democrat but suspended in 2017.