I4, i4, I 4 or I-4 may refer to:
Arts, entertainment, and media
edit- I-4: Loafing and Camouflage, a Greek film
Military
edit- 1st Life Grenadier Regiment (Sweden) (1816–1927), a Swedish infantry regiment
- Japanese submarine I-4, a World War II Type J1 submarine of the Imperial Japanese Navy
- Life Grenadier Regiment (Sweden) (1928–1997), a Swedish infantry regiment
- Tupolev I-4, a 1927 Soviet aircraft
Science and technology
edit- I-4 satellite
- i4, an integer in XML-RPC
- Industrie 4.0, the fourth Industrial Revolution
Transportation
edit- I4 engine, a piston engine
- Interstate 4, an interstate highway in Florida
- BMW i4, a German mid-size electric sedan
- Interstate Airlines, by IATA airline designator
- LB&SCR I4 class, a British locomotive
See also
edit- iPhone 4, a smartphone