Jean Yves de Blasiis (born 25 September 1973) is a French former professional footballer.
De Blasiis, a midfielder, began his career with his hometown club Bordeaux where he won the 1995 UEFA Intertoto Cup. He then moved to Caen and then Red Star. In the summer of 1999, Norwich City manager Bruce Rioch signed him on a Bosman free transfer. After a promising start, his spell at Norwich was wrecked by a cruciate ligament injury and the club released him the summer of 2001. He returned to France, where he played for his former club Bordeaux and Istres.