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

[1] Following Lintner's death in 1898, Felt was appointed as State Entomologist and remained in that position until his retirement in 1928.

[1] In retirement he worked at Bartlett Tree Research Laboratories in Stamford, Connecticut, where he died from a heart attack on December 14, 1943.

However, as State Entomologist for New York, the scope of his work included all insects of economic or medical significance.

The holotypes of the Felt-named insect species are in the National Museum of Natural History.