Nell Blair Walden Blaine (July 10, 1922 in Richmond, Virginia – November 14, 1996 in New York City) was an American landscape painter and watercolorist.
Blaine studied at the Richmond School of Art and moved to New York City in 1942 to study painting with Hans Hofmann. In 1943, she was the youngest member of the American Abstract Artists group. In 1945, she studied with Stanley William Hayter at Atelier 17.
She showed at the Tibor de Nagy Gallery starting in 1953.
Blaine contracted polio in 1959 on Mykonos Island and used a wheelchair the rest of her life, but rehabilitated the use of her hands to paint.
In 1980, Blaine was elected into the National Academy of Design as an Associate member, and became a full member in 1982. Her papers are held at Harvard University.
In 1986, Blaine received the Lifetime Achievement Award from the Women's Caucus for Art.
She lived for many years in a large apartment and studio in the building at 210 Riverside Drive with her life partner, artist Carolyn Harris. An extensive obituary of Ms. Blaine appeared in the New York Times on November 15, 1996.