Joubert Araújo Martins, or simply Beto (born 7 January 1975, in Cuiabá) is a Brazilian former footballer who played as a midfielder. During his career, he played for several Brazilian clubs such as Botafogo, Grêmio, Flamengo, Fluminense and Vasco da Gama.

After a very promising beginning to his career with Botafogo, Beto made his debut for the Brazil national team in 1995, in a friendly match against Argentina, in Buenos Aires, which Brazil won 1–0. He later played for the national team on 13 occasions, and was a member of the squad that won the 1999 Copa América, in Paraguay.

Beto won the Brazilian national championship with Botafogo de Futebol e Regatas, in 1995, and the Rio de Janeiro state championship three times in a row, in 1999, 2000 and 2001, for Flamengo. With Flamengo, he became a fan-favourite, not only for his noteworthy ability, but also because of his fighting spirit, which he famously demonstrated in the 2000 and 2001 finals against Vasco da Gama.