Hosur is a town and a municipality in Krishnagiri district in Tamil Nadu. It is the headquarters of the Hosur Taluk of Krishnagiri district. It is located about 40 kilometres (25 mi) south east of Bangalore, 48 kilometres (30 mi) north west of Krishnagiri and 306 kilometres (190 mi) west of Chennai, the state capital. Hosur is known for its expanding manufacturing industries and its pleasant climate.

Hosur is famous for its hill temple whose presiding deity is Arul Migu Maragadhambal Samedha (along with) Sree Chandrachoodeshwarar (a name for Lord Shiva). There is a temple dedicated to Lord Venkateshwara, known as Dakshina Tirupati, on a small hillock by the side of the highway, about 2 km from Hosur, towards Krishnagiri. Other temples include Agaram Bala Murugan Temple on Rayakottah road (15 K.M), Pathakotta Venkataramana swamy temple on a hillock with a river and valley view on Krishnagiri road, Bandari Anjaneya temple at Hosur, Kottai Mariamman temple at Ram nagar, and Venugopalasamy temple at Rayakottah road.

Around 80 kilometres from Hosur, is the Hogenakal Falls across the river Cauvery. Wild animals including elephants can be spotted. 52 km from Hosur is Krishnagiri, the mango capital of India and home to a large fortress of Tipu Sultan. The Krishnagiri dam is a significant hydroelectric power source and is a tourist attraction as well.

Unique to its fame, Hosur has three prominent hills, One of the Hill has Sri Chandra Choodeshwara Temple(Shivan Malai), Second has Sri Rama Temple (Vishnu Malai) and The Third one has one mandapam dedicated to Bhrama (Bharama Malai).

The Clover Greens golf course is located near Exide factory, on way to Sarjapur in an extent of 100 acres (0.40 km2) adjacent to Infosys New campus. Distance from Hosur to Ooty, Tamil Nadu is 300.8 km and takes around 6 h 25 min via NH275. Distance from Hosur, Tamil Nadu to Kollur, Karnataka is 504.4 km and travel time is around 8 h 27 min via NH4.