Georgios "George" Trontzos (alternate spelling: Giorgos) (Greek: Γιώργος Τρόντζος; ) is a retired Greek professional basketball player and basketball coach. At a height of 2.17 m (7 ft. 1.5 in.), he played at the center position. In honor of his great contributions to the club as a player, his number 6 jersey was retired by AEK Athens.
Trontzos played college basketball in the United States at Gonzaga University, with the Gonzaga Bulldogs. He was the second 7-footer in the school's history after Jean Claude Lefebvre, a 7'3" French native, who arrived at Gonzaga in the fall of 1957.
Trontzos started playing basketball with YMCA Thessaloniki. He then moved to the Greek club AEK Athens. With AEK, he won 5 Greek League championships (1964, 1965, 1966, 1968, 1970).
He also helped lead the team to the final four of the FIBA European Champions Cup of the 1965-66 season, which was the first time that the Euroleague ever used a final four system, thus helping to lead a Greek team to a final four in the Euroleague for the first time ever. He also helped to lead AEK to the championship of the 2nd-tier Cup Winner's Cup of the 1967-68 season, which was the first European championship won by any Greek team. He scored 24 points in the tournament's final game.