1966 United Kingdom general election

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The 1966 United Kingdom general election was held on 31 March 1966. The result was a landslide victory for the Labour Party led by incumbent Prime Minister Harold Wilson.

Quick facts: All 630 seats in the House of Commons 316 sea...
1966 United Kingdom general election

 1964 31 March 1966 1970 

All 630 seats in the House of Commons
316 seats needed for a majority
Opinion polls
Turnout75.8%, 1.3%
  First party Second party Third party
Leader Harold Wilson Edward Heath Jo Grimond
Party Labour Conservative Liberal
Last election 317 seats, 44.1% 304 seats, 43.4% 9 seats, 11.2%
Seats won 364[note 1] 253 12
Seat change 47 51 3
Popular vote 13,096,951 11,418,433 2,327,533
Percentage 48.0% 41.9% 8.5%
Swing 3.9% 1.5% 2.7%

Colours denote the winning party—as shown in § Results

Composition of the House of Commons after the election

Prime Minister before election

Harold Wilson

Prime Minister after election

Harold Wilson


Wilson decided to call a snap election since his government, elected a mere 17 months previously, in 1964, had an unworkably small majority of only four MPs. The Labour government was returned following this snap election with a much larger majority of 98 seats. This was the last general election in which the voting age was 21; Wilson's government passed an amendment to the Representation of the People Act in 1969 to include eligibility to vote at age 18, which was in place for the next general election in 1970.