| Jack McMillan | |
| Nationality: | Irish, British |
| Club: | University of Stirling |
| Birth Date: | 14 January 2000 |
| Birth Place: | Belfast, County Antrim, Northern Ireland |
Jack McMillan (born 14 January 2000) is a swimmer from Belfast, Northern Ireland, who competed for Ireland in the men's 4 × 200 metre freestyle relay at the 2020 Summer Olympics[1] [2] and for Great Britain at the 2024 Summer Olympics.[3] [4] He swam in the heats of the 4 × 200 metre freestyle relay and although he was swapped out of the final for Duncan Scott, McMillan was awarded a gold medal as a heat swimmer when the British team won the final.[5] In doing so he became only the second Northern Irish swimmer ever to win an Olympic gold medal in 128 years; the first had been his friend and former Team Ireland teammate Daniel Wiffen, in the same pool some 20 minutes earlier in the 800 metres freestyle.