The flag of Barcelona (Catalan and Spanish: Bandera de Barcelona) is the municipal flag of Barcelona, which combines the cross of Saint George (Catalan: Sant Jordi, Spanish: San Jorge), the patron saint of Catalonia, with the traditional red and yellow bars of the Senyera, the ancient symbol of the Crown of Aragon (here, the bars are vertical, though the modern flag of Catalonia has horizontal stripes).

It was first officially adopted in May 1906, but its use was not permitted during the rule of Francisco Franco; a slightly different version of the flag, with brighter colours and a different configuration of red bars, was readopted in 1984.

In 1996, after a number of different proposals, the City Council of Barcelona adopted a new flag, featuring the official logo of the city (which incorporates Saint George's cross) over the vertical Catalan stripes.

The flag enjoyed some political support, but was opposed by some historical and vexillological groups, who campaigned against it.

In 2004, however, the city council "recuperated" the 1906 flag legislation, restoring the original design.