| Alagappa Nagar | |
| Settlement Type: | town |
| Pushpin Map: | India Kerala |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Kerala, India |
| Coordinates: | 10.4333°N 92°W |
| Subdivision Type: | Country |
| Subdivision Name: |  India |
| Subdivision Type1: | State |
| Subdivision Name1: | Kerala |
| Subdivision Type2: | District |
| Subdivision Name2: | Thrissur |
| Unit Pref: | Metric |
| Population Density Km2: | auto |
| Demographics Type1: | Languages |
| Demographics1 Title1: | Official |
| Demographics1 Info1: | Malayalam, English |
| Timezone1: | IST |
| Utc Offset1: | +5:30 |
| Postal Code Type: | 680302 |
| Registration Plate: | KL- |
Alagappa Nagar is situated at Amballur Village near Puthukkad town in Mukundapuram Taluk in Thrissur District in Kerala State.[1] Alagappa Nagar is 12.7 km far from Thrissur city. It is 221 km far from the capital city of Thiruvananthapuram. There is a Textile Mill factory in this town named Alagappanagar Textile Mill Factory Originally build by Dr Alagappa Chettiar. In 1937, Dr. Alagappa Chettiar started Cochin Textiles, later Alagappa Textiles at Amballur near Thrissur in Kerala. The township for Cochin textile staff was named "Alagappa Nagar".
There is also a Polytechnic called Thiagarajar Polytechnic College having engineering departments of Electrical & Electronics, Mechanical and Civil Engineering.