See main article: 1966 United Kingdom general election.
| Election Name: | 1966 United Kingdom general election in Northern Ireland |
| Country: | Northern Ireland |
| Type: | parliamentary |
| Ongoing: | no |
| Previous Election: | 1964 United Kingdom general election in Northern Ireland |
| Previous Year: | 1964 |
| Election Date: | 31 March 1966 |
| Next Election: | 1970 United Kingdom general election in Northern Ireland |
| Next Year: | 1970 |
| Seats For Election: | 12 seats in Northern Ireland of the 630 seats in the House of Commons |
| Leader1: | Terence O'Neill |
| Party1: | Ulster Unionist Party |
| Leader Since1: | 1963 |
| Leaders Seat1: | Did not stand[1] |
| Seats1: | 11 |
| Popular Vote1: | 368,629 |
| Percentage1: | 61.8% |
| Swing1: | 1.4% |
| Seat Change1: | 1 |
| Leader2: | Gerry Fitt |
| Leader Since2: | 1964 |
| Party2: | Republican Labour Party |
| Leaders Seat2: | Belfast West |
| Seats2: | 1 |
| Popular Vote2: | 26,292 |
| Percentage2: | 4.4% |
| Swing2: | 2.1% |
| Seat Change2: | 1 |
The 1966 United Kingdom general election in Northern Ireland was held on 31 March with 12 MPs elected in single-seat constituencies using first-past-the-post as part of the wider general election in the United Kingdom.
The Ulster Unionists lost one seat to Gerry Fitt, leader of the new Republican Labour Party.
In the election as a whole, the Labour Party increased their majority and Harold Wilson continued as Prime Minister. The Conservative Party, which included the Ulster Unionists, were now led by Edward Heath.
| Party | MPs | Votes | |||||
|---|---|---|---|---|---|---|---|
| No. | Change | No. | % | Change | |||
| 11 | 1 | 368,629 | 61.8% | 1.4 | |||
| 1 | 1 | 26,292 | 4.4% | 2.1 | |||
| 0 | 72,613 | 12.2% | 3.9 | ||||
| 0 | 62,782 | 10.5% | 5.4 | ||||
| 0 | 29,109 | 4.9% | 2.2 | ||||
| 0 | 22,167 | 3.7% | N/A | ||||
| 0 | 14,645 | 2.5% | 2.5 | ||||
| Total | 12 | 596,237 | 100 | ||||