POSM

POSM may refer to:


 * Point-of-sale materials, advertising materials in retail shops attracting customers to specific products; see Point of sale display
 * Police Overseas Service Medal, an award in the Australian honours system.
 * Propylene Oxide / Styrene Monomer, a chemical process of manufacturing propylene and styrene; see Styrene
 * Patient Operated Selector Mechanism, a communications device for people with disabilities