Zdolbuniv (Ukrainian:Здолбунів, Russian:Здолбунов, Polish:Zdołbunów) is a small city in the Rivne Oblast (province) of western Ukraine. It is the administrative center of the Zdolbuniv Raion (district), and has an important railway station and cement plant (there is a deposit of chalk). The current estimated population is around 24,637 (as of 2011).