Alfred Thomas Agate (February 14, 1812 in Sparta, New York – January 5, 1846 in Washington, D.C.) was a noted American artist, painter and miniaturist.Agate lived in New York from 1831 to 1838. He studied with his brother, Frederick Styles Agate, a portrait and historical painter. He later went on to study with Thomas Seir Cummings. By the late 1830s, Agate was exhibiting his work at the National Academy of Design in New York, and established himself as a skilled painter in oils.