Monica Joyce (born July 16, 1958) is an English turned Irish turned American long distance runner. She is the younger sister of Irish marathoner Regina Joyce. Both sisters represented Ireland in the 1984 Summer Olympics, Regina in the Marathon and Monica in the 3000 meters. Previous to the Olympics Monica had represented Ireland at the 1982 European Athletics Championships, the 1983 World Championship and the 1984 World Cross Country Championships. She also ran in the 1985 World Cross Country Championships, finishing 12th and the IAAF World Women's Road Race Championships finishing 8th. At home she was the Irish National Champion in the 1500 metres in 1982, 1983 and 1988 with Sonia O'Sullivan a main competitor. Across the channel, she was the English National Champion in the 5000 metres in 1982 and 1985, beating her sister in 1982.