is a French former professional footballer who played as a centre-back. From 2004 to 2010, he played 21 matches for the France national team while also making three appearances for the Corsica national team.

Squillaci began his football career playing for hometown club Seynois in the commune of La Seyne-sur-Mer. In 1996, he joined Toulon and made his professional debut in the 1997–98 season, while the club was playing in Ligue 2. After a year with Toulon, Squillaci joined Monaco. He spent two seasons on the club's reserve team before joining Ajaccio on loan for two years. Squillaci returned to Monaco in 2002 and contributed to the team that won the Coupe de la Ligue in 2003. He also featured in European competition for the first time in his career and, in the 2003–04 season, played on the Monaco team that reached the 2004 UEFA Champions League Final. In the same season, Squillaci was named to the National Union of Professional Footballers (UNFP) Ligue 1 Team of the Year. In 2006, Squillaci signed a long-term contract with league rivals Lyon and won two consecutive league titles, as well as the Coupe de France in 2008 before departing for Spain in 2008 to join Sevilla. With Sevilla, he appeared in over 65 matches and won the Copa del Rey in his final season with the club. In 2010, Squillaci signed a three-year contract with English club Arsenal where he also reached the 2011 Football League Cup final.

Squillaci is a former France international and made his debut in August 2004 in a friendly match against Bosnia and Herzegovina. He has participated in UEFA Euro 2008, as well as the 2010 FIFA World Cup for his nation.