Martín Gastón Demichelis (Spanish pronunciation: ; born 20 December 1980) is an Argentine football manager and former player who is the head coach of club RB Leipzig. Demichelis spent most of his professional career with Bayern Munich in Germany (seven and a half years), winning 11 major titles with the team. He also competed in his home country with River Plate, in Spain with Espanyol, Atletico Madrid, and Málaga and in England with Manchester City. He earned 51 caps for Argentina, representing the country in two World Cups – finishing second in 2014 – and the 2015 Copa América, where the team were also runners-up. Demichelis began his coaching career as an assistant at Málaga and in the under-19 and reserve teams of Bayern Munich. He won the Argentine Primera División in 2023, his first season in charge of River Plate.