Red Oak
- Country: United States
- State: Iowa
- Population: 5,476 (2016)
- Latitude: 41° 0.6' N (41.00972°)
- Longitude: 95° 13.5' W (-95.22555°)
- Elevation: 321 m/1,055 ft. above sea level
- Time zone: America/Chicago (UTC -06:00); DST observed (UTC -05:00)
- Alternate names: Red Oak Junction