Anna Richards Brewster (1870-1952) was a painter, author, and illustrator active in New York and Pennsylvania.
Brewster studied at the Cowles Art School in Boston, the Art Students League, and Académie Julian. Brewster often collaborated as an illustrator with her mother, poet and author Anna Matlock Richards. Brewster's father, William Trost Richards, was a well-known marine painter. Her brother Theodore William Richards was a professor of chemistry at Harvard and a Nobel Prize winner, and another brother, Herbert Maule Richards, was a professor of botany at Barnard College, Columbia University. Brewster lived nine years in London. She married professor William Tenney Brewster.
Anna Richards Brewster died in Scarsdale, New York in 1952.