Sasthamkotta or Sasthamcotta is a village in the Kunnathoor Tehsil of Kollam district in Kerala. It is 25 kilometres (16 mi) from Kollam, the district headquarters and 42 kilometres (26 mi) away from Paravur. It is the location of the Sasthamcotta Sree Dharma Sastha Temple.

The place is naturally beautiful and is surrounded by hills and valleys. In the midst of the hills is the Fresh Water Lake. The extensive freshwater lake here is the biggest of its kind in Kerala.Water supply to the Kollam town is met by purifying the water from this lake. One of the features of Sasthamcotta temple is the abundance of monkeys that camp around. Because of that Sasthamcotta is famous for Monkeys.Many movies and TV serials shoted at Sasthamcotta, like Inapravukal (1965), Ente Hridayathinte Udama (2002), Ilamurathampuran (1998), Nakshathrakkannulla Rajakumaran (2002), Kuttisrank (2009) etc are some of those. The Second World Religion Conference had been held in Sasthamcotta,in which the Global Religious leaders had particularly participated.