Lewis F. Pilcher, AIA (1871–1941), was an American academic and architect active in the late-nineteenth and early-twentieth-century New York City. With William G. Tachau, he was a partner of Pilcher and Tachau, the predecessor firm of Tachau and Vought. He was a professor of art at Vassar College in Poughkeepsie, New York. He subsequently was a state architect of New York.