I-4 often refers to Interstate 4, an interstate highway in central Florida.
I-4, I4, i4 or I 4 may also refer to:
Arts, entertainment, and media I-4: Loafing and Camouflage, a Greek film
Military 1st Life Grenadier Regiment (Sweden) (1816–1927), a Swedish infantry regiment , 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 I-4 satellite i4, an integer in XML-RPC Industrie 4.0, the fourth Industrial Revolution I4, three-dimensional space group number 79 I, three-dimensional space group number 82
Transportation I4 engine, a piston engine BMW i4, a German mid-size electric sedan Interstate Airlines, by IATA airline designator LB&SCR I4 class, a British locomotive I-4 road (Bulgaria), a major road in Northern Bulgaria
See also iPhone 4, a smartphone 4I (disambiguation)