Flagstaff
- Country: United States
- State: Arizona
- Population: 71,459 (2016)
- Latitude: 35° 11.9' N (35.19807°)
- Longitude: 111° 39.1' W (-111.65127°)
- Elevation: 2,104 m/6,903 ft. above sea level
- Time zone: America/Phoenix (UTC -07:00); DST not observed
- Alternate names: Milltown, Skylight City