The 1967 Cambridge by-election of 21 September 1967 was held after the premature death of Cambridge's Labour MP (MP) Robert Davies in June 1967. The seat was highly marginal, having only been won by Labour during the previous year's Labour landslide by 439 votes, and it had only been the second time Labour had ever taken the constituency. In the ensuing by-election, a swing of more than eight percent to the Conservatives saw their candidate David Lane win by 5,978 votes.

Candidates

Result of the previous general election

Result of the by-election on 21 September 1967

The Conservative victory was described as "always expected" in an editorial in the next day's The Glasgow Herald. The result was overshadowed by the shock outcome of the same day's Walthamstow West by-election, where an 18.4% Labour to Conservative swing saw the Conservatives narrowly gain a seat Labour had held since 1929.