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 was the winner of the Cross Internacional de Venta de Baños twice consecutively in 1997 and 1998,[1] 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.
This biographical article relating to Spanish athletics is a stub.