S/S may refer to:

A Ship prefix that identifies a vessel as steam powered Vessel A common naming prefix for any Merchant vessel S/S, an industry abbreviation in the fashion industry for Spring/Summer (as opposed to A/W (Autumn/Winter)) S/S, a medical abbreviation for Signs and symptoms In clothing, refers to short-sleeved (as opposed to L/S (long-sleeved)) Solidification / Stabilization (S/S) with Cement, a method of management and reuse of contaminated waste.

See also SS (disambiguation)