Fabien Marsaud (born 31 July 1977), known professionally as Grand Corps Malade (GCM), is a French slam poet and lyricist. He has released seven studio albums so far, all of them reaching top-five status on the French SNEP chart.

GCM started writing and performing a capella at slam events in 2003. Three years later, he signed with Universal's AZ affiliate and released his debut album Midi 20, which became a top-ten selling record of the year in France. Grand Corps Malade's follow-up album, Enfant de la ville (2008), and third album 3ème temps (2010), were less successful commercially.