Fernand-Gustave-Gaston Labori (April 18, 1860 – March 14, 1917) was a French attorney. He was born in Rheims. In his professional life, he defended the accused in some of the most prominent political cases in of his day. Among his noted clients was Alfred Dreyfus, who was eventually acquitted of treason. During the Dreyfus trial he was the victim of an assassination attempt which hospitalised him for a week. The attacker was never identified.