The QCD Master Class 2021 will take place on August 29 - September 11 2021 in Saint-Jacut-de-la-Mer, a small village in Brittany (west of France) close to the city of Saint-Malo and the world famous Mont Saint-Michel. Five lectures in QCD, of 10 hours each, will be given to 35 young researchers and faculty staff members. The program of the QCD Master Class 2021 consists in lectures on three different topics each week, from Monday to Friday. The week-end in between the two weeks is left free.