SL-9

SL-9 may refer to:


 * Proton rocket, type 8K82, used from 1965-1966
 * Heckler & Koch SL8, a semi-automatic rifle
 * Comet Shoemaker–Levy 9
 * Schütte-Lanz SL.9 An Imperial German Army WWI airship.
 * (88710) 2001 SL9, a sub-kilometer asteroid and binary system