| Adaiyur | |
| Other Name: | Adaiyoor |
| Settlement Type: | suburb |
| Pushpin Map: | India Tamil Nadu |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Tamil Nadu, India |
| Coordinates: | 12.2°N 79.05°W |
| Subdivision Type: | Country |
| Subdivision Name: |  India |
| Subdivision Type1: | State |
| Subdivision Name1: | Tamil Nadu |
| Subdivision Type2: | District |
| Subdivision Name2: | Tiruvannamalai |
| Subdivision Type3: | Taluka |
| Subdivision Name3: | Tiruvannamalai taluk |
| Leader Title: | Municipal special mayor |
| Leader Name: | Balachandran (ADMK) |
| Unit Pref: | Metric |
| Elevation M: | 171 |
| Population Total: | 19560 |
| Population As Of: | 2011 |
| 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: | 606 (605,606) |
| Area Code Type: | Telephone code |
| Area Code: | 91-4175 |
| Registration Plate: | TN 25 |
| Blank1 Name Sec1: | Sex ratio |
| Blank1 Info Sec1: | 998 ♂/♀ |
| Blank2 Name Sec1: | Lok Sabha constituency |
| Blank2 Info Sec1: | Thiruvannamlai |
| Blank3 Name Sec1: | Vidhan Sabha constituency |
| Blank3 Info Sec1: | Thiruvannamalai |
Adaiyur is a suburb of the town of Thiruvannamalai, in the Indian state of Tamil Nadu. Administratively, it is a panchayat village[1] of Tiruvannamalai taluk in Tiruvannamalai District.[2] It is located on the Kanji road about 3 km northwest of downtown Thiruvannamalai. Panchayat President: M.Kalaivani munusamy from-(2020)
E. V. Velu of DMK is the MLA from Tiruvannamalai (state assembly constituency). Tiruvannamalai (Lok Sabha constituency) is the parliament constituency.
Its 2011 population was 19560.