Thiruvalla, also spelled Tiruvalla, is a municipality in Pathanamthitta district, Kerala, India. It is also the headquarters of the Thiruvalla taluk. The town is spread over an area of 27.15 km2 and has a population of 52,883, down from 56,837 in 2001. It lies on the northern banks of the Manimala River, in a land-locked region surrounded by irrigating canals and rivers.