Arthur Hay, 9th Marquess of Tweeddale (1824–1878), also known as Viscount Walden, Scottish ornithologist.

• President, Zoological Society of London

Taxon names authored

(List may be incomplete)

• 48 taxon names authored by Arthur Hay, 9th Marquess of Tweeddale

Eponyms

(List may be incomplete)

• 2 eponyms of Arthur Hay, 9th Marquess of Tweeddale

Publications

(List may be incomplete)

• Arthur, Marquis of Tweeddale 1877. Reports on the collections of birds made during the voyage of H.M.S. Challenger - No. II. On the birds of the Philippine Islands. Proceedings of the Zoological Society of London 1877(III): 535-551. BHL Reference page.