| Alangayam | |
| Native Name Lang: | Tamil |
| Settlement Type: | Town |
| Pushpin Map: | India Tamil Nadu |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Tamil Nadu, India |
| Coordinates: | 12.6°N 78.75°W |
| Subdivision Type: | Country |
| Subdivision Name: |  India |
| Subdivision Type1: | State |
| Subdivision Name1: | Tamil Nadu |
| Subdivision Type2: | District |
| Subdivision Name2: | Tirupathur |
| Unit Pref: | Metric |
| Elevation M: | 572 |
| Population Total: | 32846 appr |
| Population As Of: | 2006 |
| 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: | 635701 |
| Area Code Type: | Telephone code |
| Area Code: | 04174 |
| Registration Plate: | TN-83 |
| Blank1 Name Sec1: | Sex ratio |
| Blank1 Info Sec1: | 1000 females for every 1000 males ♂/♀ |
Alangayam is a Selection Grade Town Panchayat in Tirupathur district in the state of Tamil Nadu, India. It is located at 18 km from Vaniyambadi.
Alangayam is 8 km from the famous Vainu Bappu Observatory in Kavalur. This town is surrounded by mountains on all sides, which keeps Alangayam at a moderate temperature for most of the year.
Alangayam comprises villages named Kalai Koil, Peddur, Badakuppam, Pulugarpalli, Gejjaloor, Bunkur, Nadumiyur, Rajapalayam, MGR Nagar, Narasingapuram, Kallaraipatti and Konkiyur.
India census,[1] Alangayam had a population of 16,851. Males constitute 50% of the population and females 50%. 13% of the population is under 6 years of age.Kavalur, the place where Asia's second largest Observatory is situated 8 km from Alangayam. It is in the foot of Yelagiri Hill and Javadu Hills of Tirupathur district. Alangayam is surrounded by forests which is an integral part of disturbed Eastern Ghats.
Alangayam has a bus station which connects to many cities, including Thirupattur and Vaniyambadi. From these, it is possible to get connections to Vellore and other major cities in Tamil Nadu.