Sir John Frederick Ellenborough Crowder (10 November 1891 — 9 July 1961) was a Conservative Party politician in the United Kingdom. He was the Member of Parliament (MP) for Finchley from the 1935 general election until the 1959 general election, when he was succeeded by Margaret Thatcher (who later became British Prime Minister). Crowder served as a Hampshire County Councillor 1931-46 and a Fleet Urban District Councillor 1933–46. He was vice-chairman of the Aldershot and North Hants Conservative Association from 1930. His son Petre Crowder also became a Member of Parliament.