| Church of St. Achillius | |
|---|---|
| Црква Светог Ахилија | |
 Church of St. Achillius | |
  Church of St. Achillius Shown within Serbia | |
| 43°45′13″N 20°05′47″E / 43.753725°N 20.096284°E | |
| Location | Arilje |
| Country |  Serbia |
| Denomination | Serbian Orthodox Church |
| History | |
| Status | Church |
| Founded | 1296 |
| Founder(s) | Serbian King Stefan Dragutin |
| Dedication | Saint Achillius of Larissa |
| Architecture | |
| Functional status | Active |
| Heritage designation | Monument of Culture of Exceptional Importance |
| Designated | 1979 |
| Style | Raška style |
| Specifications | |
| Number of domes | 1 |
| Materials | Stone |
The Church of St. Achillius (Serbian: Црква Cветог Ахилија, romanized: Crkva Svetog Ahilija) or the Arilje Monastery (Serbian: Mанастир Aриље, romanized: Manastir Arilje) is a Serbian Orthodox church in Arilje, western Serbia. It is dedicated to Saint Achillius of Larissa, a fighter against Arianism and participant of the First Council of Nicaea in 325. The church was built in 1296 by Serbian King Stefan Dragutin of the Nemanjić dynasty and is located in the center of town, on the elevated plateau above the large river valley and the river Moravica and Big Rzav, and represents the most dominant object in the Arilje region.