Olaiyur is a village in Udayarpalayam tehsil in district of Ariyalur, Tamil Nadu, India. As per the data provided by Census of India in 2011, total population of Olaiyur was 3,090 which includes 1,531 males and 1,559 females. Olaiyur covers 1415.72 ha area. Pincode of Olaiyur is 608901.