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