Hosdurg Fort is a fort in Kanhangad which is part of Kasargod district in Kerala state. Hosdurg Fort with its round bastion looks imposing from a distance. Somashekara Nayaka from the Keladi Nayaka dynasty of Ikkeri built this fort. The place is made well known by the Nithyanandasram with 45 caves.The fort, now in ruins, houses a school and a few government offices. To the south-west of the fort is a temple that was also built by the Nayaks. The temple, dedicated to Shiva, is named the Poonkavanam Karpooreswara Temple.