Isaac Viciosa, Spanish runner
Isaac Viciosa (born 26 December 1969 in Cervatos de la Cueza) is a former middle distance runner from Spain.
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.