E1

E1, E01, E.I or E-1 may refer to:

==Transportation== ===Aircraft=== Azcárate E-1, a Mexican sesquiplane trainer Fokker E.I, a German fighter aircraft Grumman E-1 Tracer, an American airborne early warning aircraft Hydra Technologies E1 Gavilán, a hand-launched Mexican unmanned electronic surveillance drone Junkers E.I, the Idflieg designation for the 1916 Junkers J1 monoplane LVG E.I, a 1915 German two-seat monoplane NFW E.I, a 1917 German monoplane fighter Pfalz E.I, a Morane-Saulnier H monoplane built under licence for Germany Siemens-Schuckert E.I, a 1915 German single seat monoplane Standard E-1, a 1917 early American Army fighter aircraft