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

| Date_ | Constituency | c_u | Former_Incumbent | Winner | Cause_ |
|---|---|---|---|---|---|
| 2 March 1791 | Tiverton | u* | Dudley Ryder | Dudley Ryder | Joint Paymaster of the Forces |
| 8 March 1791 | Heytesbury | u | Michael Angelo Taylor | The Earl of Barrymore | Chose to sit for Poole |
| 12 March 1791 | Poole | c | Benjamin Lester | Benjamin Lester | Seeks re-election due to holding Admiralty contract |
| 24 March 1791 | Steyning | c(*) | Sir John Honywood | James Martin Lloyd | Chose to sit for Canterbury |
| 24 March 1791 | Steyning | c | James Martin Lloyd | Samuel Whitbread | By-election result reversed on petition 7 May 1792 |
| 28 March 1791 | Lostwithiel | u | Viscount Valletort | George Smith | Chose to sit for Fowey |
| 18 April 1791 | Buckinghamshire | u* | The Earl Verney | Marquess of Titchfield | Death |