The Flag of Olsztyn, Poland, is the official heraldic banner representing the city of Olsztyn, which is the capital of the Warmian-Masurian Voivodeship in northeastern Poland. Adopted on March 15, 2007, the flag features a field divided into two equal parts: the upper part is blue, symbolizing the Mazurian Lakes, and the lower part is white with three red oak leaves arranged in a vertical line to the hoist side. The flag’s design also includes a golden city coat of arms centered on the white field. The oak leaves represent strength, courage, and resilience, while the blue field signifies Olsztyn’s connection to the region’s numerous lakes. The city coat of arms depicts a red castle with three towers symbolizing the three historical districts of Olsztyn, all within a golden border.