Thommankuthu () is a waterfall located in Thodupuzha Thaluk in Idukki District of the southern state of Kerala, India. It is popular tourist spot in the state and one the major centres of eco-tourism in Kerala. It situated in the southern part of Western Ghats mountain range. Thomankoothu waterfalls is not a single waterfall but a series of 12 falls over a distance of 5km.