Christophe Galtier (born 28 August 1966) is a French former football defender who has managed Lille OSC in Ligue 1 since 2017.
Galtier spent most of his playing career in France before ending his career with stints in Italy and China.
From 1999 to 2004, Galtier was assistant coach at Olympique de Marseille, Aris Thessaloniki F.C. and SC Bastia. From 2004 to 2009, he worked as Alain Perrin's assistant coach at Al Ain FC, Portsmouth F.C., FC Sochaux-Montbéliard, Olympique Lyonnais and AS Saint-Étienne.
In December 2009, Galtier was appointed the head coach of AS Saint-Étienne.
On 9 May 2017, Galtier announced he would be leaving Saint-Étienne at the end of the season upon the expiration of his contract. He remains the longest serving Ligue 1 manager, having taken the reins for eight years.