The Kingston upon Hull North by-election of 27 January 1966 was held after the death of Labour Member of Parliament (MP) Henry Solomons on 7 November 1965.
The seat was retained with an increased majority by Kevin McNamara of the Labour Party.
Harold Wilson's Labour Party formed a government after winning a majority of four seats at the 1964 general election.
Wilson's hope that he would be returned to office with a larger majority had been encouraged by the government's victory at the Kingston upon Hull North by-election.
In the end, Wilson's decision was vindicated, as Labour was returned with a larger majority of 96 seats.