Carlos Javier Grossmüller (born 4 May 1983) is a Uruguayan football manager and former player who played as a midfielder.^[1]

Born in Montevideo, Uruguay, Grossmüller began his footballing career in 1988, at the age of five, as a youth player with his local team, Ombu.

In 2002, he made his professional debut for Primera División Uruguaya side Danubio, making mostly substitute appearances for the next two seasons, but being part of the 2004 championship team.

In 2004, he was sent on loan to Centro Atlético Fénix to gain experience, where he made six appearances in the Segunda División Uruguay before going back to Danubio. During the next two seasons at Danubio, he went on to play 52 league games, netted 13 goals, and won two more titles, (2006 Apertura, 2007 Clausura) which prompted interest from German side Schalke 04. Schalke later signed him in the summer of 2007 on a four-year contrac.

His first goal in the Bundesliga, a free kick against Werder Bremen, went on to be nominated as "Goal of the Month" in German television.^[2] On 31 August 2009, he returned to his former club Danubio on loan until 30 June 2010. On 30 July 2010, he was signed by newly promoted Serie A side Lecce. After Lecce were relegated at the end of the 2011–12 season, he returned to Uruguay and joined Peñarol on 22 August 2012.^[3]

In 2013, he joined Cerro and played with them until 2014.

He made another return to Danubio in 2018 and left the club in 2020.

He made his début with the Uruguay national team against Mexico in 2003.