Sir Frank Leonard Engledow (20 August 1890 – 3 July 1985) was a British agricultural botanist who carried out research at the Plant Breeding Institute at the University of Cambridge Farm from 1919 onwards.
He was a fellow of St John's College (1919–1985), Cambridge, and held the positions of University Lecturer in Agriculture (1926–1930) and Drapers Professor of Agriculture (1930–1957) at Cambridge, where he directed the School of Agriculture from 1930 to 1957.
Engledow advised the British government on agricultural production in the (former) colonies as well as in the homeland from 1927 to 1962.
He kept publishing on agricultural practices and teaching after his retirement.