9E or 9-E can refer to:
- 9th meridian east
- IATA code for Endeavor Air
- List of highways numbered 9E
- US 9E, or U.S. Route 9 in New York
- US 9E (NJ), or U.S. Route 9 in New Jersey
- SSH 9E (WA); see Washington State Route 104
- Route 9E (WMATA); see List of Metrobus routes (Washington, D.C.)
- AIM-9E, a model of AIM-9 Sidewinder
- 9e, French for 9th
- Paris 9e (9e arrondissement), or 9th arrondissement of Paris
- 9e RIMA, or 9th Marine Infantry Regiment
- 9e Régiment de Chasseurs Parachutistes, or 9th Parachute Chasseur Regiment
- HP 9E, Windows codepage 1250 in Hewlett-Packard printers