Trenton Jeffrey Julian (born December 9, 1998) is an American competitive swimmer. He is an American record holder in the short course 4×200 meter freestyle relay. He won a gold medal in the 4×200 meter freestyle relay at the 2019 World University Games. At the 2021 World Short Course Championships he won gold medals in the 4×200 meter freestyle relay and 4×50 meter medley relay and a silver medal in the 4×100 meter medley relay, swimming butterfly on the medley relays. He won a gold medal in the 4×200 meter freestyle relay, a silver medal in the 4×100 meter medley relay, and placed sixteenth in the 200 meter butterfly at the 2022 World Aquatics Championships.