Tamil Nadu Police is the primary law enforcement agency of the state of Tamil Nadu, India. It is over 150 years old and is the fifth largest state police force in India. Tamil Nadu has a police-population ratio of 1:632. The Director General of the Tamil Nadu police is Shankar Jiwal.

The Greater Chennai Police, a division of the Tamil Nadu Police, is the law enforcement agency for the city of Chennai in India and the surrounding area. The city police force is headed by a Commissioner of Police and the administrative control vests with the Tamil Nadu Home Department. There are four sub-divisions of the Greater Chennai Police, and 104 police stations. The city's traffic is managed by the Greater Chennai Traffic Police. Chennai is the first city in India to introduce e-Beat system used to measure the daily routine and performance of the police personnel.