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Isaac Seymour Andre Hadwen (1877-1947) was a Canadian veterinary entomologist.
- Anonymous 1947 (June): Dr. Seymour Hadwen. Canadian Journal of Comparative Medicine, XI (6) : 169–172. pdf
- Mitchell, C. A. 1948: Isaac Seymour Andre Hadwen (1877–1947). Proc Trans Roy Soc Canada, Third Series, 42: 95–96.
- Nielsen, N. O. 2002 (Dec): Veterinarians, the Royal Society of Canada, and the future of veterinary medicine: Part 1. Can Vet J., 43 (12) : 962–967. full text pdf