Lucia Fairchild Fuller (6 December 1872 – 20 May 1924) was an American painter.
Fuller was born in Boston, Massachusetts, the daughter of Elisabeth A. (née Nelson) and Charles Fairchild. Her paternal grandfather was Jairus C. Fairchild, the first Mayor of Madison, Wisconsin, and her uncle was Lucius Fairchild, Governor of Wisconsin; her brother was the composer Blair Fairchild.
She was educated at Shaw's Private School, the Cowles Art School under Dennis Miller Bunker, and at the Art Students League, New York, under William Merritt Chase and Henry Siddons Mowbray.
She began painting professionally in 1889, and produced chiefly miniatures. She was awarded a bronze medal at the Paris Exposition of 1900, a silver medal at Buffalo in 1901 and a gold medal at the Saint Louis Exposition of 1904. In 1906 she became associate of the National Academy and in 1913 was president of the American Society of Miniature Painters. However, she didn't limit herself to small scale work. Fuller was one of several women who painted murals for the Women's Building of the World's Colombian Exposition in Chicago. She was also a member of the New York Water Color Club.