Liam Ball (May 17, 1951 – 1984) was an Irish Olympic swimmer at both the 1968 Mexico City and 1972 Munich Olympic Summer Games, competing for the Republic of Ireland in the Men's 100 metres Breaststroke and Men's 200 metres Breaststroke at each. He was born in Derry, Northern Ireland and was a past pupil of St. Columb's College in the city.
A local hero, Ball appears in a mural on Creggan's Central Drive. The annual Liam Ball International Triathlon, hosted by Templemore Sports Complex in Derry, is also named after Ball.