Kosi Kalan is a city & municipality of Mathura district in the Indian state of Uttar Pradesh.

It is about 45 km from Mathura city and 100 km from New Delhi located in 27°47′N 77°26′E NH02 (Now NH 19 after renumbering) Delhi-Agra highway well connected with Mathura, Agra and Delhi with train and road.

The town of Kosi Kalan is governed by a Chairperson, who is elected for 5 years.

In year 1939, Kosi Kalan was declared as Notified Area and Shri Gayalal Agrawal was nominated as 1st Chairman.

Dharmveer Agarwal (2023 - current) As of 2011[update] India census,[1] Kosi Kalan had a population of 60,074.