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)
The 1st Life Grenadier Regiment ( sv, Första livgrenadjärregementet), designation I 4, was a Swedish Army infantry regiment that traced its origins back to the 16th century. It was merged into a new regiment in 1927. The regiment's soldiers we ...
(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
XML-RPC is a remote procedure call (RPC) protocol which uses XML to encode its calls and HTTP as a transport mechanism.Simon St. Laurent, Joe Johnston, Edd Dumbill. (June 2001) ''Programming Web Services with XML-RPC.'' O'Reilly. First Edition. ...
Transportation
*
I4 engine, a piston engine
*
Interstate 4
Interstate 4 (I-4) is an Interstate Highway located entirely within the U.S. state of Florida, maintained by the Florida Department of Transportation (FDOT). Spanning along a generally southwest–northeast axis, I-4 is entirely concurrent wi ...
, an interstate highway in Florida
*
BMW i4
The BMW i4 (model code G26) is a battery electric compact executive car produced by BMW since 2021. It adopts a five-door liftback body style and is marketed as a four-door coupé. The initial concept version, named BMW i Vision Dynamics, debu ...
, 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
{{Letter-Number Combination Disambiguation