Gedeon (Gideon) Barcza (August 21, 1911 in Kisújszállás – February 27, 1986 in Budapest) was a Hungarian chess master.
Barcza won the Hungarian Chess Championship eight times (1942, 1943, 1947, 1950, 1951, 1955, 1957, and 1958) and played for Hungarian team in seven Chess Olympiads (1952, 1954, 1956,1958, 1960, 1962, and 1968). He was awarded the Grandmaster title in 1954.
Barcza is remembered for the opening 1.Nf3 d5 2.g3, known as the Barcza System. Harry Golombek once said of Barcza, "[he] is a most versatile player in the openings. He plays g2–g3 sometimes on the first, sometimes on the second, sometimes on the third, and sometimes not until the fourth move."