| Thirunallur | |
| Settlement Type: | village |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Tamil Nadu, India |
| Subdivision Type: | Country |
| Subdivision Name: |  India |
| Subdivision Type1: | State |
| Subdivision Name1: | Tamil Nadu |
| Subdivision Type2: | District |
| Subdivision Name2: | Thanjavur |
| Subdivision Type3: | Taluk |
| Subdivision Name3: | Kumbakonam |
| Leader Title: | Panchayat President |
| Unit Pref: | Metric |
| Population Total: | 1042 |
| Population As Of: | 2001 |
| Population Density Km2: | auto |
| Demographics Type1: | Languages |
| Demographics1 Title1: | Official |
| Demographics1 Info1: | Tamil |
| Timezone1: | IST |
| Utc Offset1: | +5:30 |
Thirunallur is a village in the Kumbakonam taluk of Thanjavur district, Tamil Nadu, India.
According to the 2001 census, Thirunallur had a total population of 1042 with 520 males and 522 females. The sex ratio was 1.004. The literacy rate was 65.72
Thirunallur is home to the famous Arulmigu Panchavarneswarar Alayam, a temple of Lord Shiva. A lingam in the temple changes color five times a day, turning copper-coloured, light red (the color of sunrise), the colour of molten gold, emerald green, and an indescribable colour. Researchers have been unable to find the reason for the color changes.[1]