These representative diagrams show the composition of the parties in the 1966 general election.

Note: This is not the official seating plan of the House of Commons, which has five rows of benches on each side, with the government party to the right of the speaker and opposition parties to the left, but with room for only around two-thirds of MPs to sit at any one time.

This is a list of members of Parliament elected to the Parliament of the United Kingdom at the 1966 general election, held on 31 March.

Notable newcomers to the House of Commons included David Owen, John Nott, Michael Heseltine, Jack Ashley, Donald Dewar, Gwyneth Dunwoody, John Pardoe, David Winnick, Gerry Fitt and Andrew Faulds.

See the list of United Kingdom by-elections.