The Marquess of Tweeddale | |
|---|---|
 | |
| Born | Arthur Hay 9 November 1824 Yester House, Gifford, East Lothian, Scotland |
| Died | 29 December 1878 (aged 54) Chislehurst, London, England |
| Other names | Lord Arthur Hay, Viscount Walden |
| Education | University of Leipzig, University of Geneva |
| Spouses | Helene Kilmansegge
(m. 1857; died 1871)Julia Stewart-Mackenzie
(m. 1873) |
| Parent(s) | George Hay, 8th Marquess of Tweeddale Lady Susan Montagu |
| Scientific career | |
| Fields | Ornithologist, soldier |
| Institutions | Zoological Society of London (President 1868–1878) |
Colonel Arthur Hay, 9th Marquess of Tweeddale, FRS FRSE FZS (9 November 1824 – 29 December 1878), known before 1862 as Lord Arthur Hay and between 1862 and 1876 as Viscount Walden, was a Scottish soldier and ornithologist.