William Louis Abbott | |
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| Born | February 23, 1860 Philadelphia, Pennsylvania, U.S. |
| Died | April 2, 1936 (aged 76) Maryland, U.S. |
| Alma mater | University of Pennsylvania Royal College of Physicians Royal College of Surgeons |
| Occupation(s) | Medical doctor, explorer, ornithologist and field naturalist |
William Louis Abbott (23 February 1860 – 2 April 1936) was an American medical doctor, explorer, ornithologist and field naturalist. He compiled prodigious collections of biological specimens and ethnological artefacts from around the world, especially from Maritime Southeast Asia, and was a significant financial supporter of the United States National Museum collecting expeditions.