Achuthappa Nayak
| Achyutappa | |
|---|---|
| 2nd Nayaka of Tanjore | |
| In office 1580–1614 | |
| Preceded by | Sevappa Nayak | 
| Succeeded by | Raghunatha Nayak | 
| Yuvaraja of Tanjore | |
| In office 1560–1580 | |
| Personal details | |
| Died | Thanjavur, Nayakdom of Tanjore, Vijayanagara Empire. (present-day Thanjavur, Tamil Nadu, India) | 
| Children | Raghunatha Nayak | 
| Parents | 
 | 
| Military service | |
| Allegiance | Vijayanagara Empire | 
| Battles/wars | Battle of Vallamprakara | 
Achuthappa Nayak was the Nayaka of Thanjavur under the Vijayanagara Empire from 1560 to 1614. From 1560 to 1580, he was co-Nayaka along with his father and from 1580 to 1614, he ruled on his own. His reign was eventful and its later years were marked by conflict.