Oscar Lambert was born in Boulogne-sur-Mer, in the north of France. He trained in prestigious schools such as PNSD-Rosella Hightower School in Cannes, that he joined at 10 years old. He then carried on his training at the Ballet School of the Opéra national de Paris and then at Canada's National Ballet School in Toronto, where he graduates in June 2022. During his training, he was able to explore a range of techniques such as Graham, Limón and Gaga. He also had the opportunity to dance on classical, contemporary and neo-classical choreographies from Jera Wolfe, James Kudelka or Rudolf Noureev. He joins Les Grands Ballets as an apprentice for the 2022-2023 season and is promoted as corps de ballet at the end of the season.