| Semmedu | |
| Settlement Type: | Small Town |
| Pushpin Map: | India Tamil Nadu |
| Pushpin Map Caption: | Location in Tamil Nadu, India |
| Coordinates: | 11.3061°N 78.3572°W |
| Subdivision Type: | Country |
| Subdivision Name: |  India |
| Subdivision Type1: | State |
| Subdivision Name1: | Tamil Nadu |
| Subdivision Type2: | District |
| Subdivision Name2: | Namakkal |
| Subdivision Type3: | Taluk |
| Subdivision Name3: | Kollimalai |
| Unit Pref: | Metric |
| Population Total: | 9303 |
| 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 code |
| Postal Code: | 637411 |
Semmedu is a Human settlement in Kollimalai Taluk, Namakkal district in the state of Tamil Nadu, India. It is the headquarter of the Kollihils block.
Semmedu was founded in the early 1900s by Vellakinar Chinnappa Gounder, who purchased 500 acres of land from an Australian. He brought in settlers of different castes and creed to supplement the few people who were already living there. Later his sons Vellingiri, Palanisamy Kalisamy and Subbiah Gounder continued to develop the village.
The river Noyyal, a tributary to Cauvery, originates from the Siruvani Hills and flows through this village.[1] [2] The Boluvampatti forest reserve is nearby.[3] [4]