| Agarathirunallur | |
| Settlement Type: | village |
| Pushpin Map: | India Tamil Nadu |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Tamil Nadu, India |
| Coordinates: | 10.7906°N 79.5969°W |
| Subdivision Type: | Country |
| Subdivision Name: |  India |
| Subdivision Type1: | State |
| Subdivision Name1: | Tamil Nadu |
| Subdivision Type2: | District |
| Subdivision Name2: | Tiruvarur |
| Leader Title: | Panchayat President |
| Unit Pref: | Metric |
| Population Total: | 1584 |
| Population As Of: | 2001 |
| Population Density Km2: | auto |
| Demographics Type1: | Languages |
| Demographics1 Title1: | Official |
| Demographics1 Info1: | Tamil |
| Timezone1: | IST |
| Utc Offset1: | +5:30 |
Agarathirunallur is a village in the Kudavasal taluk of Tiruvarur district, Tamil Nadu, India.
As per the 2001 census, Agarathirunallur had a total population of 1584 with 838 males and 746 females. The sex ratio was 890. The literacy rate was 62.02.