Javier Adelmar Zanetti (born 10 August 1973) is an Argentine footballer who plays for Serie A club Internazionale. Javier Zanetti has played for Inter since 1995, taking the captain's armband in 1999. Known for his versatility, he is adept on both the left and right wing, having played on both flanks as a fullback as well as a winger. He slots into several midfield positions with ease, particularly as a defensive or central midfielder. Internationally, he holds the record of 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 born in Buenos Aires, picking up the nickname "Il Trattore" (The Tractor) soon after his move to Italy where his strength, resilience, stamina, and his ability to run past opposing defenders when joining the attack from his right back position earned him notoriety. More recently, he plays in the right midfield. He ended a 4-year goal drought when he scored on 5 November 2006. In the national team, he is deployed as a right back but is able to switch between defense and attack easily.

Zanetti has won five Serie A titles with Inter, having earned the nickname "Il Capitano" (The Captain) among the fans and media since taking captaincy at Inter. He holds the record for the highest all-time appearances by a non-Italian born player for an Italian club and his 700 official matches for the club put him second (behind Giuseppe Bergomi) in Inter's all-time appearances list.

Zanetti, who plans to retire with Inter and continue to work with the club thereafter, is also noted for his charity 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.

The 2010 UEFA Champions League Final on 22 May 2010 was Zanetti's 700th game with Inter, and the team's victory on the night ensured that Zanetti marked the occasion by completing a historic treble.

Javier Adelmar Zanetti was born in Buenos Aires and grew up in the harbour area in the Dock Sud district. He combined schooling and working commitments, helping his bricklayer father in masonry alongside delivering milk, and working in his cousin's grocery store without neglecting his passion for football. He began playing football on a field in the city suburbs, maintaining the pitch in his spare time.

Zanetti, after being rejected by the youth division of Argentina's Independiente, signed for Talleres de Remedios de Escalada (a second division team at the time) but moved in 1993 to the Argentine First Division club Banfield.

A 20-year-old Zanetti debuted for Banfield on 12 September 1993 in a home match against River Plate. He scored his first goal 17 days later against Newell's Old Boys in a match that ended 1–1. His outstanding performances for Banfield gained popularity from El Taladro fans and also earned him a call-up from the national team. First division giants River Plate and Boca Juniors came knocking but Zanetti decided to stay on for another year at the club. In 1995, along with fellow Argentine Sebastián Rambert, he transferred to Italy's Internazionale, becoming team owner Massimo Moratti's first-ever purchase.

He made his debut for Inter on 27 August 1995 against Vicenza in Milan. Throughout his stay with the club, he has won fourteen trophies: the UEFA Cup in 1998 – scoring the second goal for the final with a shot outside the penalty area –, the 2005, 2006 and 2010 Coppa Italia, the 2005, 2006, 2008 and 2010 Italian Super Cup, the 2005–2006, 2006–2007, 2007–2008, 2008–2009 and 2009–2010 Scudetti and the 2009-10 UEFA Champions League. In 2010 Zanetti became the first player to captain an Italian club to a treble of the Scudetto, Coppa Italia and European Cup.

Zanetti's qualities have earned him respect on and off the field. He is sometimes criticised for being too soft-spoken on the pitch, but he makes up for this by being one of Inter's most consistent, reliable, and trusted players. As such, he was rewarded with the club captaincy, taking over from legendary defender Giuseppe Bergomi. Being a part of the squad for the last 13 seasons and with 700 appearances, he is currently the team's longest-tenured player, and the second overall behind Bergomi (758) in the all-time list of most capped Inter players. To Inter fans, Zanetti is one of the greatest players to have ever worn the colours of the black and blue. He celebrated his 600th cap for Inter in style with a 1–0 win over newly promoted Lecce. Minutes before the match, he was presented with a commemorative plate by vice-captain Iván Córdoba to mark the special occasion.