| Kosi Kalan | |
| Settlement Type: | city |
| Pushpin Map: | India Uttar Pradesh |
| Pushpin Map Caption: | Location in Uttar Pradesh, India |
| Coordinates: | 27.7833°N 103°W |
| Subdivision Type: | Country |
| Subdivision Name: |  India |
| Subdivision Type1: | State |
| Subdivision Name1: | Uttar Pradesh |
| Subdivision Type2: | District |
| Subdivision Name2: | Mathura |
| Government Type: | Municipality |
| Unit Pref: | Metric |
| Population Total: | 60,074 |
| Population As Of: | 2011 |
| Population Density Km2: | auto |
| Demographics Type1: | Languages |
| Demographics1 Title1: | official |
| Demographics1 Info1: | Hindi |
| Demographics1 Title2: | Regional |
| Demographics1 Info2: | Braj Bhasha |
| Timezone1: | IST |
| Utc Offset1: | +5:30 |
| Postal Code Type: | PIN |
| Postal Code: | 281403 |
| Area Code Type: | Telephone code |
| Area Code: | 05662 |
| Registration Plate: | UP85 |
| Website: | https://mathura.nic.in/ |
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. Khurd and Kalan Persian language word which means small and big respectively when two villages have same name then it is distinguished as Kalan means big and Khurd means small.
Khurd and Kalan are Persian language word which means small and big respectively when two villages have same name then it is distinguished as Kalan means big and Khurd means small with village name.
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. 1. Lala Gayalal Agrawal (1939 - 1944)
2. Lalaram Agarwal (1944 - 1953)
3. Chetram Agarwal (1953 - 1956)
4. Pannalal Agarwal (3 Months in 1956)
5. Basant Lal Khandelwal (1956 - 1959)
6. Phool Chand Jain (1959 - 1964)
7. Hariram Bansal (1960 - 1963)
8. Babulal Agrawal (1964 - 1971)
9. Harmukh Ray Khandelwal (1971 - 1972)
10. Jagadish Prasad Agrawal (1973 - 1976)
11. Jagadish Prasad Agrawal (1976 - 1980)
12. Jagadish Prasad Agarwal (1988 - 1994)
13. Indira Sharma (1995 - 2000)
14. Roshanlal Agrawal (2001 - 2005)
15. Vandana Agarwal (2006 - 2012)
16. Bhagwat Prasad Ruhela (2012 - 2017)
17. Narendra Kumar (2017 – Current2023)
18. Dharmveer Agarwal (2023 - current)
India census,[1] Kosi Kalan had a population of 60,074. Males constitute 53.15% of the population and females 46.85%. Kosi Kalan has an average literacy rate of 69.8%, lower than the national average of 74.04%: male literacy is 78.41%, and female literacy is 60.08%. In Kosi Kalan, 18% of the population is under 6 years of age.
There are many big companies which have their manufacturing units in Kosi and others have plans to set up units in near future.