The 1969 Islington North by-election was a parliamentary by-election held on 30 October 1969 for the House of Commons constituency of Islington North in Islington, north London.
The seat had become vacant when the constituency's Labour Member of Parliament (MP), Gerry Reynolds died on 7 June 1969, aged 42. He had held the seat since a by-election in 1958 following the death of his predecessor, Wilfred Fienburgh.
Although traditionally a safe Labour seat, the Conservatives had gained control of Islington in the 1968 Islington Council election.
The result of the contest was a victory for the Labour Party candidate, Michael O'Halloran, who won with a majority of 1,534 votes over the Conservative candidate Andrew Pearce.
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Labour | Michael O'Halloran | 7,288 | 49.2 | −10.2 | |
| Conservative | Andrew Pearce | 5,754 | 38.9 | +8.2 | |
| Liberal | Eric G. Thwaites | 1,514 | 10.2 | +0.4 | |
| Independent Socialist | Austin Williams | 245 | 1.7 | New | |
| Majority | 1,534 | 10.3 | −18.5 | ||
| Turnout | 14,801 | 32.8 | −21.4 | ||
| Registered electors | 45,077 | ||||
| Labour hold | Swing | −9.2 | |||