Alexander Brook (July 14, 1898 – February 26, 1980) was an American artist, teacher, and art critic, known for his paintings.

[2] In 1914 he entered the Art Students League of New York, where he studied for four years with Kenneth Hayes Miller, John Christen Johansen, Frank DuMond, George Bridgman, and Dimitri Romanovski.

[3] During his twenties, Brooks painted still lifes and posed figures with vigor and sensuality.

After a second marriage to Libby Bergere and spells living in Savannah, Georgia, in 1945 he married his third wife, the painter Gina Knee.

In 1948 they moved to Sag Harbor on eastern Long Island, where he retired from painting around 1965.