| Election Name: | 1890 Stamford by-election |
| Type: | parliamentary |
| Seats For Election: | Stamford constituency |
| Ongoing: | no |
| Previous Election: | 1886 United Kingdom general election |
| Previous Year: | 1886 |
| Next Election: | 1892 United Kingdom general election |
| Next Year: | 1892 |
| Turnout: | 77.8% (Previous election was unopposed) |
| Candidate1: | Harry Cust |
| Image1: | Harry Cust by Cyril Flower (1890s).jpg |
| Party1: | Conservative Party (UK) |
| Popular Vote1: | 4,236 |
| Percentage1: | 51.7% |
| Candidate2: | Arthur Priestley |
| Party2: | Liberal Party (UK) |
| Popular Vote2: | 3,954 |
| Percentage2: | 48.3% |
| MP | |
| Before Election: | John Lawrance |
| Before Party: | Conservative Party (UK) |
| After Election: | Harry Cust |
| After Party: | Conservative Party (UK) |
| Country: | United Kingdom |
The 1890 Stamford by-election was held on 7 March 1890, when the incumbent Conservative MP John Lawrance resigned after being appointed a Judge of the Queen's Bench division of the High Court of Justice.[1] The by-election was won by the Conservative Party candidate Henry Cust.[2]