| Kelasen | |
| Coordinates: | 1.1167°N 111.55°W |
| Pushpin Map: | Borneo |
| Pushpin Label Position: | right |
| Subdivision Type: | Country |
| Subdivision Name: |  Malaysia |
| Subdivision Type1: | State |
| Elevation M: | 91 |
Kelasen (also known as Klassen) is a settlement in Sarawak, Malaysia. It lies on the Pan Borneo Highway approximately 145km (90miles) east-south-east of the state capital Kuching. Neighbouring settlements include: