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- OnMobile
- On Heroes, Hero-Worship, & the Heroic in History
- On the Face of the Waters
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- Onaeme hill
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- Onakkoor
- Onakkunnu
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- Onam and Islam
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- Onbadhu Roobai Nottu
- Once Again (2018 film)
- Once More (1997 film)
- Once There Was a War
- Once Upon A Time In Mumbaai
- Once Upon a Time in Bihar
- Once Upon a Time in Kolkata
- Once Upon a Time in Mumbaai
- Once Upon a Warrior
- Onchiam
- Ond Chance Kodi
- Onda, Bankura
- Onda (Vidhan Sabha constituency)
- Onda (community development block)
- Onda Thana Mahavidyalaya
- Ondaatje Letters
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- Ondagram railway station
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- Ondiveeran
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- One-Day Internationals in England in 2005
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- One-humped camel
- OneWeb
- One (2017 film)
- One 2 Ka 4
- One Avighna Park
- One Day: Justice Delivered
- One Day International
- One Day International cricket hat-tricks
- One Day at a Time (1975 TV series)
- One Fourth Labs
- One Friday Night
- One Heart- Many Breaks
- One Heart (film)
- One Horizon Center
- One Hundred Poems of Tukaram
- One Hundred and Fourth Amendment of the Constitution of India
- One Hundred and Second Amendment of the Constitution of India
- One Hundred and Third Amendment of the Constitution of India
- One Indiabulls Park
- One Last Question
- One Life Is Not Enough
- One Man Show (film)
- One Nation, One Election
- One Night Stand (2016 film)
- One Race Films
- One Rank, One Pension
- One Rank One Pension Scheme
- One Town, Eluru
- One Town, Vijayawada
- One Two Three
- One Water
- One Way Ticket (2008 film)
- One World Media
- One by Two (1993 film)
- One by Two (2014 film)
- Oneindia
- Oneindia.com
- Oneness (film)
- Onesicritus
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- Ong Lepcha
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- Ongallur (gram panchayat)
- Ongan languages
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- Onge language
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- Ongole (Lok Sabha constituency)
- Ongole Municipal Corporation
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- Onha
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- Onla
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- Only Much Louder
- Onnaam Muhurtham
- Onnaamvattam Kandappol
- Onnam Loka Mahayudham
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- Onnaman
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- Onnanu Nammal
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- Onnum Onnum Moonu (film)
- Onnum Onnum Pathinonnu
- Onomastus
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- Ontari Poratam
- Ontario Gurdwara Committee
- Onti
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- Onward Technologies
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- Oo Antava Oo Oo Antava
- Oodi Oodi Uzhaikanum
- Ooh La La (Shreya Ghoshal and Bappi Lahiri song)
- Ooh La La (film)
- Ooh La La La (film)
- Ooha
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- Oohalu Gusagusalade
- Oohalu Gusagusalade (TV series)
- Oolampara
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- Oomerabad
- Oommen Chandy
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- Oonche Log (1965 film)
- Oonche Log (1985 film)
- Oondees
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- Ooparwala Jaane
- Oops! (film)
- Oor Panchayathu
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- Ooti
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- Ootukulangara Bhagavathy Temple, Peruvemba
- Ooty
- Ooty (film)
- Ooty Golf Course
- Ooty Lake
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- Ooty Radio Telescope
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- Ooty bus stand
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- Ooyala (film)
- Oozham (1988 film)
- Opadometa
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- Opera House (1961 film)
- Opera House (Vidhan Sabha constituency)
- Operating system
- Operation Achse
- Operation Acrobat
- Operation Agreement
- Operation Ajay
- Operation Allies Refuge
- Operation Amla
- Operation Antha
- Operation Avalanche
- Operation Avalanche naval order of battle
- Operation Bajadere
- Operation Bajrang
- Operation Barclay
- Operation Barga
- Operation Barisal
- Operation Battleaxe
- Operation Baytown
- Operation Bison (Jammu & Kashmir 1948)
- Operation Black Thunder
- Operation Black Tornado
- Operation Blackstone
- Operation Blue Star
- Operation Bluebird
- Operation Bowler
- Operation Braganza
- Operation Brasstacks
- Operation Brevity
- Operation Brevity order of battle
- Operation Brushwood
- Operation Buckland
- Operation Cactus
- Operation Cactus-Lilly
- Operation Caravan
- Operation Carpetbagger
- Operation Cascade
- Operation Checkmate (Sri Lanka)
- Operation Chengiz Khan
- Operation Chequerboard
- Operation Chesterfield
- Operation Chestnut
- Operation Chettyford
- Operation Clean-up
- Operation Cleaver
- Operation Cocoon
- Operation Combine
- Operation Compass
- Operation Corkscrew
- Operation Creek
- Operation Crusader
- Operation Crusader order of battle
- Operation Desert Hawk
- Operation Devi Shakti
- Operation Devon
- Operation Diadem
- Operation Diadem order of battle
- Operation Duryodhana
- Operation Duryodhana (film)
- Operation Duryodhana 2
- Operation Dwarka
- Operation Eraze
- Operation Flagpole (World War II)
- Operation Flax
- Operation Flipper
- Operation Flood
- Operation Flowers are Blooming
- Operation Fustian
- Operation Ganga
- Operation Gibraltar
- Operation Gold Fish
- Operation Golden Bird
- Operation Goldflake
- Operation Grand Slam
- Operation Grapeshot order of battle
- Operation Green Hunt
- Operation Herring
- Operation Hotel Intercontinental
- Operation Husky
- Operation Husky order of battle
- Operation Jackpot