Gathorne Gathorne-Hardy, 5th Earl of Cranbrook, OStJ, FLS, FZS, FRGS, , FIBiol (born 20 June 1933), styled Lord Medway until 1978, is a British zoologist, biologist, naturalist, and peer.

[1] Since 1956, he has been active in the fields of ornithology, mammalogy, and zooarchaeology, and has influenced research and education in Southeast Asia.

[2] His career focus was on swiftlets and other small Southeast Asian birds, as well as on mammals, including orangutans.

[9] He was a senior lecturer in zoology between 1961 and 1970 at University of Malaya, Kuala Lumpur, and a Jajason Siswa Lokantara Fellow between 1960 and 1961 at Indonesia.

[11] He succeeded as Earl of Cranbrook upon his father's death in 1978, and sat as a Conservative peer in the House of Lords.