SS21 or variation, may refer to:
OTR-21 Tochka, a Soviet short-range ballistic missile with the NATO designation "SS-21 Scarab" , a United States Navy submarine which served during World War I , several submarines of the navy of Chile Higashi-Murayama Station (station code SS21), Higashimurayama, Tokyo, Japan; a train station SS21, a district of Damansara Utama, Petaling Jaya, Selangor, Malaysia SS21 The Healing, a LOVERBOY fashion label fashion collection by Charles Jeffrey (fashion designer) 21st Waffen Mountain Division of the SS Skanderbeg (21st SS division; S.S. 21) of Albanian partisans serving Germany in WWII
See also
SS-N-21 "Sampson", a Soviet submarine launched ballistic missile