P.V. Isaac (? - 18 December 1960) was an Indian entomologist who served as the last Imperial Entomologist in British India. He was a specialist on the horseflies (Tabanidae).
Isaac was born to Mathen Varkey, a magistrate in Travancore State. Studied at Imperial College, London.
Isaac was married to Sucy (died 2000), daughter of Rao Saheb John Kurian and the had two sons and two daughters, one being Mary Roy.
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Isaac, P. V. (1923). The Turnip Gall Weevil, Ceuthorrhynchus Pleurostigma, Marsh. Annals of Applied Biology, 10(2), 190–193. doi:10.1111/j.1744-7348.1923.tb05666.x
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- Isaac, P. V. 1924a. Papers on Indian Tabanidae. VI. The male and female genitalia of Tabanus tenens, Wlk. Dep. Agric. India (Entomol.) 8: 102-108.
- Isaac, P.V. 1924b. Papers on Indian Tabanidae. VII. Notes on the life history of Tabanus striatus, Fabr. (=hilaris, Wlk.). Dep. Agric. India (Entomol.) 8: 108.
- Isaac, P.V. 1925. The bionomics and life-histories of some of the common Tabanidae of Pusa. Dep. Agric. India (Entomol.) 9: 21-28.
- Isaac, P. V. (1932). Papers on Indian Tabanidae. IX. The Life-history of Haematopota roralis Fb. Indian Journal of Veterinary Science 22(3):278-280.
- Isaac, P. V. "The bionomics and life-histories of some of the common Tabanidae of Pusa." Memoirs of the Department of Agriculture in India (Entomological series) 9.2 (1926): 21-28.
- Isaac, P. V. (1925). Papers on Indian Tabanidae. VI. The male and female genitalia of Tabanus tenens Wlk. Memoirs of the Department of Agriculture in India (Entomological series), 8(10), 102-108.
- ISAAC, P. (1925). Papers on Indian Tabanidae, VIII. The Bionomics and Life-histories of some of the Common Tabanidae of Pusa. Memoirs of the Department of Agriculture in India, 9(2).
- ISAAC, P. (1924). Papers on Indian Tabanidae. i. A Practical and Simple Method for rearing Tabanid Larvae, ii. The Number of Moults in Tabanid Larvae, iii. The Life-history of Tabanus crassus, Walker, and the Identity of the Female of the Species. Memoirs of the Department of Agriculture in India, 8(5).
- Isaac, P.V. 1924. Papers on Indian Tabanidae. 1-3. Mem. Dep. Agric. India Ent Ser. 8(5):53-62
- Isaac, P.V. 1925a. Papers on Indian Tabanidae. 4-7. Mem. Dep. Agric. India Ent. Ser. 8(10): 93-109
- Isaac, P.V. 1925b. Papers on Indian Tabanidae. 8. Mem. Dep. Agric. India Ent. Ser. 9(2):21-28
- P. V. Isaac and T. V. Venkatraman (1941) A Key for the Identification of the Larvae of the known Lepidopterous Borers of Sugarcane in India based on morphological Characters. Indian Journal of Agricultural Sciences 11:795–803.
Issac, P. V. and Venkataraman, T. V. (1941) A key for the identification of the pupae of the known lepidopterous borers of sugar-cane in India based on morphological characters. Indian. J. Agric. Sci. 11:804–815.
EE Green describes a species of scale from coconut on Ross Island collected by Isaac 10.1017/S0007485300019088