George Stuart Fullerton (August 18, 1859 – March 23, 1925) was an American philosopher and psychologist.

[2] He was the host of the first annual meeting of the American Psychological Association in 1892 at the University of Pennsylvania, and the APA's fifth president, in 1896.

He remained imprisoned for four years, until the end of the war, and conditions were so harsh that he returned to the U.S. with his health permanently damaged.

In 1884 Fullerton married Miss Rebekah Daingerfield Smith of Alexandria, Virginia; she died in 1892.

Nearly an invalid for the last decade of his life, Fullerton died by suicide on March 23, 1925, at the age of 66.