OM3 may refer to:

• Olympus OM-3 camera
• Multi-mode optical fiber type OM3

• Volleyball at the 2010 Asian Games - Squads
• Volleyball at the 2010 Asian Games - Women
• Volleyball at the 2010 Asian Games - Women's team rosters
• Volleyball at the 2010 Asian Games - Women's volleyball
• Volleyball at the 2010 Asian Games – Men's team rosters
• Volleyball at the 2010 Asian Games – Women's team rosters
• Volleyball at the 2011 All-Africa Games - Men's tournament
• Volleyball at the 2011 All-Africa Games - Women's tournament
• Volleyball at the 2011 Island Games - Men 's tournament
• Volleyball at the 2011 Pacific Games - Men's tournament
• Volleyball at the 2011 Pacific Games - Women's tournament
• Volleyball at the 2011 Pan American Games - Men's
• Volleyball at the 2011 Pan American Games - Men's indoor tournament
• Volleyball at the 2011 Pan American Games - Women's
• Volleyball at the 2011 Pan American Games - Women's squads
• Volleyball at the 2011 Pan American Games - Women's team rosters
• Volleyball at the 2011 Pan American Games – Women's squads
• Volleyball at the 2011 Pan Arab Games - Men's tournament
• Volleyball at the 2011 Pan Arab Games - Women's team rosters
• Volleyball at the 2011 Pan Arab Games - Women's tournament
• Volleyball at the 2011 Pan Arab Games – Men's tournament
• Volleyball at the 2011 Pan Arab Games – Women's team rosters
• Volleyball at the 2011 Pan Arab Games – Women's tournament
• Volleyball at the 2012 Summer Olympics - Men
• Volleyball at the 2012 Summer Olympics - Men's NORCECA qualification