Lewis Greenleaf Adams, AIA, (1897–1977), was an American architect based in New York City who practiced in mid- to late-twentieth-century New York, New Jersey, and Connecticut, as part of the firms Mamfeldt, Adams & Prentice, Adams & Prentice (fl. 1929-1941), Mamfeldt, Adams & Woodbridge, Adams & Woodbridge (fl. 1945-1974), and under his own name at the end of his life (fl. 1974-1977), always based in New York City.