Hosur is an industrial city located in Krishnagiri district in the Tamil Nadu state of India. Hosur is one of the 21 municipal corporations in Tamil Nadu. It is located on the bank of the river River Ponnaiyar, southeast of Bengaluru and west of Chennai, the state capital. Hosur is home to major manufacturing industries including Stellantis, Ashok Leyland, Titan, TVS Motors, Caterpillar, Ather Energy, Schaeffler, and many others.
Hosur was known as Murasu Nadu during the Chola period in the 13th century. From the 16th century onwards, the town has come to be known by its present name. The Chandrachoodeshwara Swamy Temple, an 11th-century temple, has inscriptions that tell about the contributions made by Hoysalas. Hoysalas ruled Hosur around 1200 CE and contributed to the temple. Then it came under Vijayanagara Empire.
Later, Hosur was part of Kingdom of Mysore. From 1790 to 1792 Tipu Sultan lost the third Anglo-Mysore war to the British. In 1801 he handed over the southern part of the Mysore kingdom as a partial settlement to the Presidencies and provinces of British India. During British period, Salem collector Walton Illiat Lockardt, made Hosur as the head quarters for Salem district.
James Hunter served as a lieutenant in the Royal Artillery. He was a military painter, and his sketches portrayed aspects of military and everyday life.
During 1980s industrialization began with the help of State Industries Promotion Corporation of Tamil Nadu and Hosur became a Industrial Town. After that the basic development started taking place.
Hosur town was constituted as Selection grade Town Panchayat in the year 1962 and then upgraded to Second Grade Municipality in the Year 1992 and to Selection Grade Municipality in the year 1998. Later Hosur Municipal Corporation formed in year of 2019 and becomes one of the 21 municipal corporations in Tamil Nadu.
In April 2022, plans to expand the city limit into 740 square kilometres were announced.
Hosur city is governed by Hosur City Municipal Corporation, which was established in 2019.