Berestechko (Ukrainian: Берестечко; Polish: Beresteczko) is a city in Volyn Oblast, Ukraine. It is located at around 50°21′0″N 25°7′0″E / 50.35°N 25.116667°E / 50.35; 25.116667. It is located on the Styr River. As of 2001, its population was 1,904.