Tandarai
{{More citations needed|date=May 2025}}
{{Use dmy dates|date=January 2019}}
{{Use Indian English|date=January 2019}}{{Infobox settlement
| name = Tandarai
| native_name =
| native_name_lang =
| other_name =
| nickname =
| settlement_type = panchayat town
| image_skyline =
| image_alt =
| image_caption =
| pushpin_map = India Tamil Nadu#India3
| pushpin_label_position = right
| pushpin_map_alt =
| pushpin_map_caption = Location in Tamil Nadu, India
| coordinates = {{coord|12.1|N|79.20|E|display=inline,title}}
| subdivision_type = Country
| subdivision_name = {{flag|India}}
| subdivision_type1 = State
| subdivision_name1 = Tamil Nadu
| subdivision_type2 = District
| subdivision_name2 = Tiruvanamalai
| established_title =
| established_date =
| founder =
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| governing_body =
| unit_pref = Metric
| area_footnotes =
| area_rank =
| area_total_km2 =
| elevation_footnotes =
| elevation_m = 81
| population_total = 5201
| population_as_of = 2001
| population_rank =
| population_density_km2 = auto
| population_demonym =
| population_footnotes =
| demographics_type1 = Languages
| demographics1_title1 = Official
| demographics1_info1 = Tamil
| timezone1 = IST
| utc_offset1 = +5:30
| postal_code_type =
| postal_code =
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| website =
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}}
Tandarai is a Panchayat town in Tiruvanamalai district, Tamil Nadu India.{{cite web |date=2011 |title=Primary Census Abstract Data Tables – India: Final Population Totals |url=https://censusindia.gov.in/nada/index.php/catalog/42554/download/46180/2011-IndiaStateDistSbDistVill-0000.xlsx |archive-url=https://web.archive.org/web/20220711042331/https://censusindia.gov.in/nada/index.php/catalog/42554/download/46180/2011-IndiaStateDistSbDistVill-0000.xlsx |archive-date=11 July 2022 |access-date=27 April 2025 |website=Office of the Registrar General & Census Commissioner, India |publisher=Ministry of Home Affairs, Government of India}} It is the fourth largest town in Kilpennathur taluk and has one railway station. It lies between Vettavalam and Veraiyur and has a population of 5201 and altitude of 81m.