Kologriv is a town located in the Kostroma Oblast of Russia. It serves as the administrative center of the Kologrivsky District and is situated on the left bank of the Unzha River, approximately 339 kilometers (211 miles) northeast of the oblast's administrative center, Kostroma.
According to census data, the population of the town has seen a steady decline over recent decades. The population was recorded at 4,306 in the 1989 Soviet census, decreasing to 3,700 in 2002, 3,314 in 2010, and reaching 2,468 by the 2021 census.