OSW

OSW may refer to:


 * Centre for Eastern Studies, a Polish think tank
 * FAL OSW, a variant of the FN FAL folding-stock paratrooper rifle
 * Objective Sniper Weapon, the original name of the Barrett XM109
 * Official Scrabble Words, a Scrabble lexicon
 * Open Spatial Workshop, a group of three Australian artists, winner of the 2005 Melbourne Prize for Urban Sculpture