Interstate 12 (I-12) is an Interstate Highway located entirely within the U.S. state of Louisiana.
The submarine I-12 was a Japanese A2 type long-range fleet submarine.
The Jönköping Regiment (Jönköpings regemente), designation I 12, was a Swedish Army infantry regiment that traced its origins back to the 16th century.
The Småland Regiment (Smålands regemente), designations I 12 and I 12/Fo 17, was a Swedish Army infantry regiment that traced its origins back to the 16th century.
A straight-12 engine or inline-12 engine is a twelve-cylinder internal combustion engine with all twelve cylinders mounted in a straight line along the crankcase.