S2

S2 or S II may refer to:

==Science and technology== S2 (star), a star in the Milky Way galaxy S/2007 S 2, a natural satellite of Saturn S2 impact (ie, "Spherules 2"), major impact of early Earth S2 map projection, a map projection created at Google S2 steel (shock resisting steel) S2: Keep out of the reach of children, a safety phrase in chemistry Disulfur (S2), an allotrope of sulfur Sulfide () anion