Giancarlo Zolezzi Seoane (born August 27, 1981) is a Chilean former swimmer, who specialized in long-distance freestyle events.

Zolezzi made his official debut at the 2000 Summer Olympics in Sydney, where he competed in the 400 m freestyle.

Swimming in heat one, he raced to second place and fortieth overall by 0.17 of a second behind Singapore's Sng Ju Wei in 4:01.51.

[2][3] At the 2004 Summer Olympics in Athens, Zolezzi extended his program, swimming in three individual events.

He blasted a new Chilean record of 3:56.52 to top the second heat against seven other swimmers, including early favorites Moss Burmester of New Zealand and Petar Stoychev of Bulgaria.