Coos Bay
- Country: United States
- State: Oregon
- Population: 16,292 (2016)
- Latitude: 43° 22' N (43.3665°)
- Longitude: 124° 13.1' W (-124.21789°)
- Elevation: 7 m/24 ft. above sea level
- Time zone: America/Los_Angeles (UTC -08:00); DST observed (UTC -07:00)
- Alternate names: Coose Bay, Empire, Marshfield