Ob

Ob may refer to:

• Ob River, a river in West Siberia, Russia
• Ob Sea, an artificial lake on the Ob River
• Ob, Russia, a town in Novosibirsk Oblast, Russia
• Ob, Germany, place in Bidingen, Bavaria, Germany
• Gulf of Ob, a bay of the Arctic Ocean in Northern Russia
• Object Manager (Windows), a Windows NT subsystem
• The fictional currency of the Gands in Eric Frank Russell's The Great Explosion