| Sannasinallur | |
| Native Name Lang: | Tamil |
| Nickname: | Sannasi |
| 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: | Ariyalur |
| Government Type: | panchayat |
| Unit Pref: | Metric |
| Population Total: | 3554 |
| Population As Of: | 2001 |
| Population Density Km2: | auto |
| Demographics Type1: | Languages |
| Demographics1 Title1: | Official |
| Demographics1 Info1: | Tamil |
| Timezone1: | IST |
| Utc Offset1: | +5:30 |
| Postal Code Type: | PIN |
| Postal Code: | 621730 |
| Registration Plate: | TN- |
| Blank1 Name Sec1: | Coastline |
| Blank1 Info Sec1: | 90km (60miles) |
| Blank2 Name Sec1: | Nearest city |
| Blank2 Info Sec1: | tittagudi@virudachalam |
| Blank3 Name Sec1: | Sex ratio |
| Blank3 Info Sec1: | 1076 ♂/♀ |
| Blank4 Name Sec1: | Literacy |
| Blank4 Info Sec1: | 54.71% |
| Blank5 Name Sec1: | Lok Sabha constituency |
| Blank5 Info Sec1: | Kunnam |
Sannasinallur is a village in Sendurai Taluk of Ariyalur District, Tamil Nadu, India. Located on the southern bank of the Vellar River bordering Caddalore District. Once part of Trichy District and now in Ariyalur District. People here are highly literate. Many are qualified engineers,doctors,IAS and IPS Officers and many work overseas, mainly in Singapore and Middle east Countries. There is a post office and a high school teaching up to 10th standard. There are quite a few temples and is well known for Pacchai Amman Temple and Semmalaiappar Temple. And just across the river, is the famous Thiruvatta Thurai(also known as Thirunelvoyel Arathurai) Sivan temple. There are two cement factories nearby and is well connected by road and rail with the rest of the state. Trichy international airport is just 70 km away.
As per the 2001 census, Sannasinallur had a total population of 3554 with 1712 males and 1842 females.[1]