Isaac Carlos Viciosa Plaza (born 26 December 1969) is a Spanish former middle distance runner.
Viciosa is a former European record holder at 3000m and the first European man under 7:30. He won European Championships 1998 for 5000m, and was 2nd for 1500m at European Championships 1994. He was the winner of the Cross Internacional de Venta de Baños twice consecutively in 1997 and 1998, and he won the second Cross de Atapuerca race in his native Spain at the age of 35.
His daughters Maria and Angela Viciosa are also distance runners.
800 metres – 1:46.90 min (1996)
1500 metres – 3:30.94 min (1998)
3000 metres – 7:29.34 min (1998)
5000 metres – 13:09.63 min (1998)
10,000 metres – 28:26.75 min (2003)
Isaac Viciosa at World Athletics
Isaac Viciosa at Tilastopaja (registration required)
Isaac Viciosa at InterSportStats