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Thirukoilur Ulagalantha Perumal Temple is located at Tirukoilur town in Viluppuram District in Tamil Nadu. The temple is dedicated to Vishnu.The temple has a 5-tier rajagopuram with a height of 192 ft (59 m), the third tallest temple tower in Tamil Nadu, after the one in Srirangam Ranganathaswamy temple and Srivilliputhur Andal Temple.

The temple covers an area of 5 acres (20,000 m2) and houses residential buildings in the precincts around the temple tower. The presiding deity, Ulagalantha Perumal has an imposing image made of Tharu wood with foot raised. The temple tank is situated right opposite to the temple. The image of Krishna is made of saligrama stone and is housed in a separate shrine.

Various festivals are celebrated in the temple, with the 15 day Panguni Brahmmotsavam in March -April with Sri Pushpavalli Thayar Oonjal, being the most prominent one.

Moolavar : Ulagalantha perumal

utchavar : Aaaynar, Gopalan

Thayaar : Poongothai Nachiyar(Lakshmi)

Ulagalantha Perumal Temple is a Hindu temple dedicated to Vishnu located in Tirukkoyilur, Tamil Nadu, India. Constructed in the Dravidian style of architecture, the temple is glorified in the Divya Prabandha, the early medieval Tamil canon of the Azhwar saints from the 6th - 9th centuries AD.

It is one of the 108 Divyadesam dedicated to Vishnu, who is worshipped as Ulagalantha Perumal and his consort Lakshmi as Poongothai. The temple is believed to have been built by the Medieval Cholas, with later contributions from Vijayanagar kings and Madurai Nayaks.

The temple covers an area of 5 acres (20,000 m2) and has a temple tower that is the third tallest in Tamil Nadu, measuring 192 ft (59 m) in height.

As per Hindu legend, Vamana, a dwarf and an avatar of Vishnu, appeared here to quell the pride of Asura king Bali. The temple is believed to be the place where the first three Azhwars, the Vaishnava saints, namely, Poigai Alvar, Bhoothathalvar and Peyalvar attained salvation.

The temple is one of the Panchakanna (Krishnaranya) Kshetrams, the five holy temples associated with Krishna, an avatar of Vishnu. Ulagalantha Perumal is believed to have appeared to king Mahabali and the Azhwars.

Six daily rituals and a dozen yearly festivals are held at the temple, of which the chariot festival, celebrated during the Tamil month of Chittirai (March - April),

Do:

Do pray your Ishta Devata before pilgrimage to Temple.
Do contact Temple Devasthanam information centre for enquiry, temple information and for Pooja details etc.
Do reserve your travel and accommodation at Temple well in advance.
Do bath and wear clean clothes before you enter the temple.
Do concentrate on God and Goddess inside the temple.
Do maintain silence and recite your Istamantram to yourself inside the temple.
Do observe ancient custom and traditions while in Temple.
Do respect religious sentiments at Temple.
Do deposit your offerings in the hundi only.

Don't s:

Do not come to Temple for any purpose other than worshipping of God and Goddess.
Do not smoke at Temple.
Do not consume alcoholic drinks at Temple.
Do not eat non-vegetarian food in the Kshetram.
Do not approach mediators for quick Darshanam. It may cause inconvenient to others.
Do not carry any weapon inside the temple.
Do not wear any head guards like helmets, caps, turbans and hats inside the temple premises.
Do not perform Sastanga Pranama inside the Sanctum Sanctorum.
Do not take much time while performing Sparsa Darshanam to God in Garbhagriha.
Do not buy spurious prasadams from street vendors.
Do not encourage beggars at Temple.
Do not spit or create nuisance in the premises of the temple.