I4, i4, I 4 or I-4 may 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
• 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

• I-4 satellite
• i4, an integer in XML-RPC
• Industrie 4.0, the fourth Industrial Revolution

Transportation

• 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

• iPhone 4, a smartphone

Topics referred to by the same term

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