Alberto de Castro Guedes (born August 13, 1951) is a Brazilian singer, songwriter, and guitarist.

When he was 18 years old he took part in the V Singers International Festival, with the song "Feira Moderna" composed jointly with Fernando Brant.

He formed the musical group Clube da Esquina with Milton Nascimento, Lô Borges, and Fernando Brant.

The Minas Gerais folk music tradition was the group's main influence, along with 1960s rock and choro.

In 1978 he issued the LP Amor de Índio, whose title song was Guedes's biggest career success.