LII

LII may refer to:


 * Year AD 52, in Roman numerals
 * 52 (number) in Roman numerals
 * Laser-induced incandescence, a method of measuring particle sizes in flames
 * Legal Information Institute, a non-profit public service of Cornell Law School
 * Lithium iodide (LiI)
 * Logical Intuitive Introvert, one of the 16 classifications of people in socionics
 * Gromov Flight Research Institute, a Russian aircraft test base (ЛИИ, or LII, in Russian)
 * Super Bowl LII, the fifty-second NFL Super Bowl