Onakkoor is a village in Ernakulam district in the Indian state of Kerala. The main attractions in the village are Onakkoor River and Onakkoor Temple. Other attractions include Edayan Lake and Onakkoor check dam (Ooranattu chera). Famous writer George Onakkoor is associated with this village. The SH-42 Highway passes through Onakkoor. Piravom is the nearest town with markets and hospitals. The dominant religions are Hinduism and Christianity.

Onakkoor is a part of Pambakuda Grama Panchayat and is situated in Muvattupuzha Taluk.

1. Onakkoor temple (Onakkoor devi temple)
2. Kalarickal temple (Kalarickal paradevatha temple)
3. Shasthankal temple (Puthen Sabarimala sree dharmashasthaa temple)
4. Pandianpara temple (Pandianpara bhadrakali temple)

1. Onakkoor Valiyapally-St Marys Orthodox church - Located at onakkoor Pallippady(First church of Onakkoor)
2. Onakkoor Sehiyon Orthodox Syrian church - located near Onakkoor Palam junction.
3. St. Mary's Malankara Catholic Church near Onakkoor Pandiyan Para Temple.
4. St. George Orthodox Chapel

1. Bus Terminal (Private & Public) is available at around 5 km away at Piravom.
2. Nearest railway station is Piravom Road railway station, at Velloor.
3. Nearest airport is Cochin International Airport at Nedumbaserry

As of 2011 India census, Onakkoor had a population of 12,421 with 6,203 males and 6,218 females.