Corby: Danesholme ward, after the disqualification of Labour councillor Peter Petch who did not attend any meetings in six months. The vacancy will not be filled as the authority will be abolished next April.
Corby: Kingswood ward, after the resignation of Labour councillor Isabel McNab. No byelection will take place as the authority will be abolished next April.
Enfield: Southbury ward, after the death of Labour councillor Chris Bond. Term ends 2022.
In England, all current vacancies which do not fill a term ending in 2021 will be held on 6 May 2021, the ordinary day for local elections. In Wales, all byelections will be held in a period between 1 February and 16 April 2021.
Highland: The byelection due in Aird and Loch Ness ward will be held on 5 November.
Orkney Islands: The byelection due in North Isles ward will be held on 1 October.
Perth and Kinross: The byelection due in Perth City North ward will be held on 26 November.
Perth and Kinross: The byelection due in Perth City South ward will be held on 26 November.