Kvasyliv (Ukrainian: Квасилів; Polish: Kwasiłów) is a rural settlement in Rivne Raion (district) of Rivne Oblast (province) in western Ukraine.

It was administratively located in the Volhynian Voivodeship in the Lesser Poland Province.

[3] Following World War I, Kwasiłów, as it was known in Polish, became again part of Poland, within which it was administratively located in the Równe County in the Wołyń Voivodeship.

Following the joint German-Soviet invasion of Poland, which started World War II in September 1939, the village was occupied by the Soviet Union until 1941, then by Germany until 1944, and then re-occupied by the Soviet Union, which eventually annexed it from Poland in 1945.

On this day, a new law entered into force which abolished this status, and Kvasyliv became a rural settlement.