Javier Adelmar Zanetti (born 10 August 1973 in Buenos Aires) is an Argentine footballer who currently plays as a defender for Italian Serie A club Internazionale, of which he has been part since 1995 and the captain since 1999. He is the most capped player in the history of the Argentine national team and has played in the 1996 Olympic tournament and in two World Cups, in 1998 and 2002.

Known as "Pupi" in Argentina, Zanetti was nicknamed "Il Trattore" (The Tractor) after moving to Italy because of his strength, resilience, stamina, and his ability to run past opposing defenders when joining the attack from his right back position. More recently, he plays in the right midfield. He ended a 4-year goal drought when he scored on 5 November 2006.^[2] In the national team, he is deployed as a right back but is able to switch between defense and attack easily.

Zanetti has won four Serie A titles with Inter, and since becoming their captain, he is also referred to by team supporters and media as "Il Capitano" (The Captain). He has appeared in more than 600 official matches for the club and over 450 Serie A matches which is the highest all-time total among non-Italian born players.

Zanetti, who plans to retire with Inter and continue to work with the club thereafter, is also notable for his charitable work, running a foundation to benefit disadvantaged children in Argentina. He has been named an ambassador for the SOS Children's Villages project in Argentina by FIFA, and in 2005, he received the Ambrogino d'Oro award from the Milan townhall for his social initiative.