Martín Leandro Castrogiovanni (Italian: [marˈtiŋ kastrodʒoˈvanni], Spanish: [maɾˈtiŋ kastɾoʝoˈβani]; born October 21, 1981) is an Italian-Argentine retired rugby union player.

Castrogiovanni moved to Italy as a teenager and represented the Italian national team 119 times over 14 years.

He played every game of Italy's 2004 Six Nations campaign and was a reliable member of their forward pack, being selected man of the match in the victory against Scotland.

He did not play in Racing's European Rugby Champions Cup semi-final against Leicester Tigers, telling the club that he was in Argentina attending to family matters.

However, he was instead spotted in Las Vegas partying with players from Parisian football club Paris Saint-Germain, including superstar Zlatan Ibrahimović, with photos of the group appearing in multiple French publications.