The Kalyanasundaresar Temple is a Hindu temple situated in the village of Nallur near the town of Papanasam in Thanjavur district, Tamil Nadu, India. The presiding deity is Shiva who is worshipped in the form of a lingam. The temple was constructed by the Medieval Cholas.
The temple is located 8 km away from Kumbakonam on the Kumbakonam- Tanjore road. The temple is 3 km away from Sundaraperumal kovil and 1 km from Vazhapazhakadai. The best mode is taking town buses from Kumbakonam or mini buses from Darasuram. The Sundaraperumal kovil railway station is also close by to the temple.
According to the Hindu Puranas, at the spot where the temple now stands, the sage Agastya witnessed the marriage of Shiva and Parvathi in Kailasa. Kunti, the mother of the Pandavas, central character in the Indian epic Mahabharatha is believed to have bathed in the temple tank of this shrine.
The temple dates from the time of the 10th century AD Medieval Chola king Uttama Chola whose inscriptions have been found in its walls. Another inscription dated to the fifteenth year of Raja Raja Chola makes a reference to Panchavanmahadevi chaturvedimanagalam which is another name for the village of Nallur. There are also inscription by Later Chola kings and by Hoysala monarchs.
Nallur Kali 
The temple is also famous for Kali on the southern prakaram(closed precincts of a temple) of the temple.
- P. V. Jagadisa Ayyar (1920). South Indian shrines: illustrated. Madras Times Printing and Pub. Co. pp. 360–369.