List of Great Britain by-elections (1790–1800) By-elections 17th Parliament (1790–1796)

| Date_ | Constituency | c_u | Former_Incumbent | Winner | Cause_ |
|---|---|---|---|---|---|
| 20 December 1790 | Haslemere | u | James Lowther | Richard Penn | Chose to sit for Westmorland |
| 21 December 1790 | Banbury | u | Lord North | Lord North | Succeeded to a peerage |
| 21 December 1790 | Oxford | c | Peregrine Bertie | Arthur Annesley | Death |
| 22 December 1790 | Heytesbury | u | William Pierce Ashe à Court | Michael Angelo Taylor | Resignation |
| 22 December 1790 | Huntingdon | u | John George Montagu | Henry Speed | Death |
| 22 December 1790 | Warwick | u | The Lord Arden | The Lord Arden | Registrar of the Court of the Admiralty |
| 24 December 1790 | Great Bedwyn | u* | Marquess of Graham | Viscount Stopford | Succeeded to a peerage |