Harold Munro Fox FRS[1] (né Fuchs; 28 September 1889 – 29 January 1967)[1][2] was an English zoologist.

[3] After graduation he went to the Plymouth Laboratory of the Marine Biological Association of the United Kingdom (1911–1912), where he worked with Cresswell Shearer and Walter de Morgan on the genetics of sea urchin hybrids.

When the First World War broke out, he enlisted in the Royal Army Service Corps and served with the City of London Yeomanry in the Balkans, Egypt, Salonika (Thessaloniki), and Palestine.

During this time he finished a thesis on the flagellate protozoan Bodo, the research on which he had begun at Plymouth, and presented it to Gonville and Caius College, Cambridge, to apply for fellowship.

In 1927, Fox was appointed head of the Department of Zoology and Comparative Anatomy at the University of Birmingham, a post he held until 1941.