Thomas Littleton Powys, 4th Baron Lilford (18 March 1833 – 17 June 1896), was a British aristocrat and ornithologist.

[2] Lilford was one of the eight founders of the British Ornithologists' Union in 1858 and its president from 1867 until his death.

Until 1891, his aviaries featured birds from around the globe, including rheas, kiwis, pink-headed ducks and a pair of free-flying bearded vultures.

[1] He died in June 1896, aged 63, and was succeeded in the barony by his eldest son from his first marriage, John.

A metal plaque commemorating a "Cedar of Atlantica" planted by Lady Lilford in 1897, was found in 2005 and is displayed in the visitor centre at Bank Hall.