Roslyn
- County:
- Kittitas County
- County Seat:
- No
- Area (mi²):
- 4.39
- State:
- Washington
Roslyn is a city located in Kittitas County, Washington. Roslyn has a 2026 population of 960. Roslyn is currently declining at a rate of -0.93% annually and its population has decreased by -0.1% since the most recent census, which recorded a population of 961 in 2020.