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

| Date_ | Constituency | c_u | Former_Incumbent | Winner | Cause_ |
|---|---|---|---|---|---|
| 26 August 1791 | Newtown | u | Sir Richard Worsley | Sir Richard Worsley | Resignation due to attempt to be appointed as Governor of the Isle of Wight and was then re-elected |
| 17 January 1792 | Grantham | u | Francis Cockayne Cust | Philip Yorke | Death |
| 18 January 1792 | Warwick | c* | Henry Gage | George Villiers | Elevated to the peerage |
| 25 January 1792 | Merioneth | u* | Evan Lloyd Vaughan | Robert Williames Vaughan | Death |
| 7 February 1792 | Calne | u | John Morris | Benjamin Vaughan | Resignation |
| 10 February 1792 | Truro | u | William Augustus Spencer Boscawen | Charles Ingoldsby Paulet | Resignation (Commissioner of the Salt Office) |
| 11 February 1792 | Great Bedwyn | u | Lord Doune | Edward Hyde East | Death |
| 20 February 1792 | Malmesbury | u | Paul Benfield | Sir James Sanderson | Resignation |