Arturo "Thunder" Gatti (born April 15, 1972) is a retired Canadian professional boxer. Gatti was born in Italy to Italian parents, but his family moved to Canada when he was young and he was raised in Montreal (borough of Montreal-Nord). Upon turning pro in 1991, Gatti relocated to Jersey City, New Jersey, but after retirement has since moved back to Montreal.
He has participated in Ring Magazine's "fight of the year" a total of four times (1997, 1998, 2002, and 2003). His brother, Joe Gatti, is also a professional boxer. Arturo announced his retirement on July 14, 2007.
Arturo Gatti was a member of the Canadian National Team, and was training to represent Canada at the 1992 Summer Olympics, but at age 19 (in 1991), he decided to turn pro instead. He began boxing professionally on the night of June 10, 1991, with a third round knockout of Jose Gonzalez in Secaucus. He went undefeated for six bouts before losing to King Solomon by split decision in six rounds on November 17, 1992.