Keizer
- Country: United States
- State: Oregon
- Population: 38,980 (2016)
- Latitude: 44° 59.4' N (44.99012°)
- Longitude: 123° 1.6' W (-123.02621°)
- Elevation: 42 m/138 ft. above sea level
- Time zone: America/Los_Angeles (UTC -08:00); DST observed (UTC -07:00)