| Official Name: | Ølensjøen |
| Other Name: | Ølen |
| Settlement Type: | Village |
| Pushpin Map: | Rogaland#Norway |
| Pushpin Label Position: | left |
| Pushpin Map Caption: | Location in Rogaland county |
| Subdivision Type: | Country |
| Subdivision Name: | Norway |
| Subdivision Name1: | Western Norway |
| Subdivision Name2: | Rogaland |
| Subdivision Type3: | District |
| Subdivision Name3: | Haugaland |
| Subdivision Type4: | Municipality |
| Subdivision Name4: | Vindafjord |
| Utc Offset1: | +01:00 |
| Utc Offset1 Dst: | +02:00 |
| Area Total Km2: | 1.08 |
| Population As Of: | 2019 |
| Population Total: | 1259 |
| Population Density Km2: | 1166 |
| Postal Code Type: | Post Code |
| Postal Code: | 5580 Ølen |
| Elevation M: | 15 |
| Elevation Footnotes: | [1] |
| Coordinates: | 59.6042°N 5.8078°W |
Ølensjøen or Ølen is the administrative centre of Vindafjord municipality in Rogaland county, Norway. The village is located at the southern end of the Ølsfjorden, along the European route E134 highway, just east of the village of Ølensvåg. The 1.08km2 village has a population (2019) of 1,259 and a population density of .[2] It is the largest urban area in the municipality.[3]
Ølensjøen is the regional center for commerce for the inner part of the Haugalandet area. It has a secondary school, sports club, and a public swimming pool. Norway's largest privately owned slaughterhouse, Fatland slakteri, is located in Ølensjøen. There is a large shopping center with a pharmacy and post office in Ølensjøen that serves the residents of the Etne-Vindafjord area. Ølen Church is also located in this village.
Prior to 2006, Ølensjøen was the administrative centre of the old municipality of Ølen. In 2006, the municipality was merged with Vindafjord, and the administration of the new, larger municipality of Vindafjord was moved to Ølensjøen.[4]