Thomas Nelson Annandale CIE FRSE (15 June 1876, in Edinburgh – 10 April 1924, in Calcutta) was a British zoologist, entomologist, anthropologist, and herpetologist.

The eldest son of Thomas Annandale, the regius professor of clinical surgery at the University of Edinburgh.

[4] He started the Records and Memoirs of the Indian Museum journals and in 1916, he became the first director of the Zoological Survey of India that he helped found.

This change placed an official equality with botany and geology and made more funds available for expeditions to various parts of India.

He held the position of director until 1924 and was succeeded by Robert Beresford Seymour Sewell (1880–1964).