Ephraim Porter Felt

Ephraim Porter Felt (7 January 1868 Salem – 14 December 1943) was an American entomologist who specialised in Diptera.

Felt worked mostly with Nematocera, particularly Cecidomyiidae. However, as State Entomologist for New York, the scope of his work included all insects of economic or medical significance. He wrote Insects Affecting Park and Woodland Trees (New York State Museum Memoir 8, 1905-1906) and Plant Galls and Gall Makers (Ithaca, N.Y., Comstock Pub. Co., 1940), and described over 1,000 species in scientific journals. He described the mosquito genus Culiseta. The holotypes of the Felt-named insect species are in the National Museum of Natural History.

He was the great grandfather of Edward P. Felt (1959–2001), a victim aboard United Airlines Flight 93 during the attacks on September 11, 2001.