The Oxford by-election, 1938 was a parliamentary by-election for the British House of Commons constituency of Oxford, held on 27 October 1938. The by-election was triggered when Robert Croft Bourne, the sitting Conservative Member of Parliament died on 7 August 1938. He had served as MP for the constituency since a 1924 by-election.
On 29 September 1938, British Prime Minister Neville Chamberlain had signed the Munich Agreement, handing over the Sudetenland to German control. This issue polarised British politics at the time, with many Labour supporters, Liberals, and some Conservatives strongly opposed to this policy of appeasement. Many by-elections in the autumn of 1938 were fought around this issue, including this one and also the Bridgwater by-election, three weeks later, where Liberals and Labour again united in support of an Independent anti-appeasement candidate.
The Liberal Party had selected Ivor Davies, a 23-year-old graduate of Edinburgh University, despite the fact that he was the candidate for Central Aberdeenshire at the same time. The Labour Party selected Patrick Gordon Walker, who had contested the seat at the 1935 general election.