ODG can refer to: .odg, the file extension for an OpenDocument drawing file Ontario Drive and Gear Limited, a former company specializing in amphibious vehicles; now part of ARGO Old Dungeon Ghyll, Lake District, England, popular with walkers and climbers Objective difference grade, a perceived quality in digital audio Olive drab green, a color used in military clothing and equipment Overseas Development Group, a fictional UK espionage agency that James Bond works for in Carte Blanche by Jeffery Deaver.