'''I6''' or '''I-6''' may refer to: * {{ship|Japanese submarine|I-6}}, an Imperial Japanese Navy submarine launched in 1935 and sunk in 1944 * Polikarpov I-6, a Soviet fighter prototype of the 1930s * Straight-six engine, six-cylinder internal combustion engine * Ravenloft (module), or "I6: ''Ravenloft''," a 1983 adventure module for ''Dungeons & Dragons'' * Roewe i6, a Chinese saloon
'''I 6''' is a Swedish regimental designation (6th Infantry Regiment) that has been used by the following units: * Västgöta Regiment (1816–1927) * North Scanian Infantry Regiment (1928–1963)
==See also== * 6I (disambiguation)
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