The Flag of Siegen-Wittgenstein is the official banner representing the district (Kreis) of Siegen-Wittgenstein, located in North Rhine-Westphalia, Germany. It consists of three horizontal stripes: red, white, and blue. The top and bottom stripes are equal in width, while the middle one is slightly wider. The flag was adopted on May 24, 1975, following the merger of Siegen and Wittgenstein districts. The colors and proportions reflect those found in the coat of arms of both territories, symbolizing their unification under a single administrative entity.