The Flag of the Republic of San Marco is a tricolour with three vertical stripes of green, white, and red.

The canton features a Lion of Saint Mark within a frame of diagonal red, white, and green stripes.

[1] The reinstatement of the Lion of Saint Mark was an outward expression of Venetian independence from Austria.

The usage of a green-white-red tricolour as the basis of the flag was also significant insofar as it signified greater links between the republic and the wider Italian independence movement.

[2] The flag lasted until 27 August 1849 when the Republic of San Marco was returned to Austrian control following the decisive Battle of Novara.