Illuppaiyur is a village in Ariyalur district, Tamil Nadu, India. The village is near the river Kundaru. Illupai trees are found in abundance in this area; the village gets its name from this.
Mostly two communities reside here, Nadar and Chettiar. Illuppaiyur has more than five temples.
As per the 2001 census, Illuppaiyur had a total population of 3,231 people with 1511 males and 1720 females.