The 1935 Labour Party leadership election took place on 26 November 1935 when Herbert Morrison and Arthur Greenwood challenged Clement Attlee, the incumbent party leader of only one month and one day.

With the Labour Party now having roughly three times as many MPs as in the 1931-5 Parliament, both Morrison and Greenwood stood in the annual election for leader, feeling that Attlee's appointment had only been intended as an interim measure.

Morrison had not been an MP at the time of the October appointment, whilst Greenwood had declined to offer himself as a candidate then because he was strongly associated with trade union leaders such as Ernest Bevin, who were widely regarded as the reasons for forcing Lansbury to resign, a move that the vast majority of Labour MPs opposed.

The first round of the contest took place on 26 November 1935:[1] As the lowest-placed candidate, Greenwood was eliminated from the race.

The second contest took place on 3 December: With a clear majority, Attlee retained the party leadership.