Marconato played at the 1994 FIBA Europe Under-20 Championship with the Italian under-20 junior national team, and he also played at the 1996 FIBA Europe Under-22 Championship, which was held in Istanbul. After that, he was a regular member of the senior Italian national team, with which he won a gold medal at the 1999 EuroBasket, a bronze medal at the 2003 EuroBasket, and a silver medal at the 2004 Athens Summer Olympic Games. In addition, Marconato was also a member of the Italian roster at the 2006 FIBA World Championship.