| Official Name: | Wellawaya |
| Native Name: | Sinhala; Sinhalese: වැල්ලවාය Tamil: வெல்லவாயா |
| Settlement Type: | Town |
| Pushpin Map: | Sri Lanka |
| Pushpin Label Position: | above |
| Pushpin Mapsize: | 250 |
| Pushpin Map Caption: | Location in Sri Lanka |
| Subdivision Type: | Country |
| Subdivision Name: | Sri Lanka |
| Subdivision Name1: | Uva Province |
| Subdivision Type2: | District |
| Subdivision Name2: | Monaragala District |
| Unit Pref: | Imperial |
| Population As Of: | 2012[1] |
| Population Total: | 54,099 |
| Timezone: | Sri Lanka Standard Time |
| Utc Offset: | +5:30 |
| Coordinates: | 6.7333°N 81.1°W |
Wellawaya (si|වැල්ලවාය|translit=Vællavāya; ta|வெல்லவாய|translit=Vellavāyā) is a town located in Monaragala District, Uva Province of Sri Lanka.
On 25 August 1630 a major battle took place near Wellawaya between Portuguese forces and the Sinhalese under the command of King Rajasinghe II, which resulted in a complete rout of the Portuguese army.[2]
Wellawaya is where the first armed attack occurred, on 5 April 1971, by the communist Janatha Vimukthi Peramuna (JVP) against the Government of Ceylon, under Prime Minister Sirimavo Bandaranaike.