Indian history
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- ObedullaganjObedullaganj is a town and a nagar panchayat in Raisen district in the Indian state of Mad
- Ochre Coloured Pottery cultureBronze Age culture of the Indo-Gangetic Plain
- OdantapuriBuddhist Mahavihara
- Oiniwar dynastyDynasty of medieval India
- Old Western RājasthāniOld Western Rājasthāni (also known as Maru-Gurjari, Old Gujarātī) is the ancestor of the m
- OnattukaraHistoric state in Kerala, India
- Operation Desert HawkPakistani military operation in the Rann of Kutch
- Operation DwarkaNaval Operation In Indo-Pakistani War Of 1965
- Operation Gibraltar1965 Pakistani military operation
- Operation Grand SlamPakistani military operation in the 1965 Indo-Pakistani War
- Operation Lal Dora1983 Indian military operation in Mauritius
- Operation U-GoJapanese Invasion of India in 1944
- Order of the Star of IndiaDormant 1861 British order of chivalry
- Origin of the Gupta dynastyThere are conflicting theories regarding the original homeland and ancestry of the Gupta d
- Origin of the Gurjara-PratiharasGurjara-Pratihara dynasty
- Orissa famine of 1866One of the biggest famines in India
- OughterardOughterard (Irish: Uachtar Ard) is a small town on the banks of the Owenriff River close t