David Lack

David Lambert Lack (July 16, 1910 - March 12, 1973) was a British ornithologist and biologist.

Lack was born in London and educated at Gresham's School, Norfolk and Magdalene College, Cambridge where he studied Natural Sciences. He was a teacher until 1940, taking a year off to study bird behaviour on the Galapagos Islands. During World War Two he was involved in early work on radar. In 1945 he became Director of the Edward Grey Institute of Field Ornithology.

Lack's scientific research included work on population biology and density dependent regulation. He wrote a number of books, including The Life of the Robin (1943) and Swifts in a Tower (1956).