| Election Name: | 1986 Fulham by-election |
| Type: | parliamentary |
| Country: | United Kingdom |
| Seats For Election: | Constituency of Fulham |
| Ongoing: | no |
| Previous Election: | 1983 United Kingdom general election |
| Previous Year: | 1983 |
| Election Date: | 10 April 1986 |
| Candidate1: | Nick Raynsford |
| Party1: | Labour Party (UK) |
| Popular Vote1: | 16,451 |
| Percentage1: | 43.20% |
| Swing1: | 9.17% |
| Candidate2: | Matthew Carrington |
| Party2: | Conservative Party (UK) |
| Popular Vote2: | 12,948 |
| Percentage2: | 34.00% |
| Swing2: | 12.18% |
| Candidate3: | Roger Liddle |
| Party3: | Social Democratic Party (UK) |
| Popular Vote3: | 6,953 |
| Percentage3: | 18.26% |
| Swing3: | 0.01% |
| MP | |
| Posttitle: | Subsequent MP |
| Before Election: | Martin Stevens |
| Before Party: | Conservative Party (UK) |
| After Election: | Nick Raynsford |
| After Party: | Labour Party (UK) |
| Map Size: | 200px |
| Next Election: | 1987 United Kingdom general election |
| Next Year: | 1987 |
The Fulham by-election, in Fulham, on 10 April 1986 was held following the death of the Conservative Member of Parliament (MP) Martin Stevens on 10 January that year. In a seat that had changed hands on a few occasions, it was won by Nick Raynsford of Labour, only to be regained by the Tories in the general election 14 months later.