The flag of Rio Grande do Sul is the official flag of the Brazilian state of Rio Grande do Sul.

[1] The flag of the republic was created in a decree from November 12, 1836, which described the flag, which was originally square in shape and lacking the coat of arms in the centre.

[2] It stayed the state flag until 1937 when under the leadership of Getúlio Vargas, the use of state symbols was banned under the Brazilian Constitution of 1937.

[3][1] There are many suggestions for the meaning of the colours of the flag including that the green and yellow represent Brazil, with the red representing war.

[1] Another suggested meaning is that the green represents the pampas forest, the red symbolizes revolution and courage, and the yellow represents riches.