The Brazil national under-20 football team, also known as Brazil Sub-20 or Seleção Sub-20, represents Brazil in association football at this age level and is controlled by the Brazilian Football Confederation (CBF).

The team has won the South American Youth Championship a record twelve times and is the second most successful nation in the FIFA U-20 World Cup, having won the competition five times. It also plays in unofficial under-19 and under-21 tournaments, such as the Toulon Tournament, of which Brazil is an eight-time winner.

Notable players that came through the ranks and went on to play for the senior team include Ronaldinho, Kaká, Rivaldo, Romário, Marcos, Roberto Carlos, César Sampaio, Cláudio Taffarel, Bebeto, Dida, Neymar, Dani Alves, Maicon, Adriano, Júlio Baptista, Luisão, Alex, Giovane Élber, Leonardo, Müller, Silas, Marcelo, David Luiz, Willian, Jô and Lucas Moura, among others.

巴西 20 歲以下足球隊是巴西足球協會管理的國家男子 20 歲以下足球隊。該隊參加由南美足球協會舉辦的南美青年足球錦標賽,以及由國際足總舉辦的國際足總 U-20 世界盃。巴西隊是南美和世界青年足球錦標賽中最成功的球隊之一,分別奪得 11 次南美冠軍和 5 次世界冠軍。

巴西 U20 隊的球員主要來自巴西國內聯賽的青年隊,也有少數球員來自國外的俱樂部。球隊的主教練由巴西足球協會任命,目前由拉蒙·梅內塞斯擔任。