The flag that is used as the symbol of Masuria, a region in Poland, and the Masurian people, is divided horizontally into three stripes, that are, blue, white, and red.

The design was inspired by the French tricolour flag, and the colours stood for freedom, equality, and fraternity.

The Corps Masovia Königsberg functioned until 28 October 1935, when it was dissolved from the orders of Nazi Party.

The flag remained in general use until 1945, when in the aftermath of World War II, the expulsion of the German population from the region, then annexed into Poland.

Nowadays, some organizations are attempting the revival of the flag usage in the Warmian-Masurian Voivodeship, Poland.