| Official Name: | Ruen |
| Native Name: | Руен |
| Subdivision Type: | Country |
| Subdivision Type1: | Provinces (Oblast) |
| Timezone: | EET |
| Utc Offset: | +2 |
| Timezone Dst: | EEST |
| Utc Offset Dst: | +3 |
| Pushpin Map: | Bulgaria |
| Pushpin Label Position: | left |
| Pushpin Map Caption: | Location of Ruen |
| Leader Title: | Mayor |
| Postal Code Type: | Postal Code |
| Subdivision Name1: | Burgas |
| Population Total: | 2,423 |
| Population Footnotes: | http://grao.bg/tna/tab02.txt |
| Population As Of: | 2008 |
| Postal Code: | 8540 |
| Area Code: | 05944 |
| Coordinates: | 42.8°N 44°W |
| Leader Name: | Durhan Mustafa |
Ruen (Bulgarian: Руен, in Bulgarian pronounced as /ˈruɛn/; Turkish: Ulanlı) is a village in southeastern Bulgaria, part of Burgas Province. It is the administrative centre of Ruen municipality, which lies in the northern part of Burgas Province.
Ruen municipality includes the following 41 places:
The population of the municipality is predominantly Turkish (see Turks in Bulgaria), with some Bulgarians, Roma and Pomaks.