O Bando do Velho Jack (in English: "Old Jack's Gang" or "Old Jack's Band"), or simply "O Bando", is a Brazilian rock/blues band formed in 1995 in the city of Campo Grande, capital of the Mato Grosso do Sul state, located in the central-west region of Brazil.

The band's name is a reference to the famous Tennessee whiskey Jack Daniel's. Considered one of the most influent bands on the Brazilian classic rock music scenario, the band is playing self-writen music mixed with some covers.