Dorothea Warren O'Hara was an American ceramic artist who won the Lifetime Membership Prize from the National Arts Club and a gold medal at the Panama–Pacific International Exposition. She was president of the Keramic Society of Greater New York and president of the New York National Society of Craftsmen.

Dorothea Warren was born on August 31, 1873, in Kansas City, Missouri. In 1915 she won the Lifetime Membership Prize from the National Arts Club and a gold medal at the Panama–Pacific International Exposition. In 1923 she published The Art of Enameling on Porcelain. She died in May 1972 in Delray Beach, Florida.