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- Opadometa
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- Operation Achse
- Operation Acrobat
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- 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
- Operation Jackpot Nalli C.I.D 999
- Operation Java
- Operation Kamala
- Operation Kaveri
- Operation Khukri
- Operation Kingpin (World War II)
- Operation Krohcol
- Operation Ladbroke
- Operation Lal Dora
- Operation Lalgarh
- Operation Lighthouse
- Operation Madad (Indian Navy)
- Operation Maitri
- Operation Meghdoot
- Operation Mincemeat
- Operation Mincemeat (film)
- Operation Mincemeat (musical)
- Operation Namaste
- Operation Narcissus
- Operation Neer
- Operation New Hope
- Operation Ochsenkopf
- Operation Oliver
- Operation Omega
- Operation Orient
- Operation Parakram Medal
- Operation Parindey
- Operation Parindey (film)
- Operation Pawan
- Operation Polo
- Operation Poomalai
- Operation Python
- Operation Raahat
- Operation Radd-ul-Fasaad
- Operation Rahat
- Operation Rajiv
- Operation Retribution
- Operation Roast
- Operation Romeo (film)
- Operation Roukhala
- Operation Sadbhavana (Goodwill)
- Operation Safe Homecoming
- Operation Safed Sagar
- Operation Sahyog
- Operation Samudra Maitri
- Operation Sankat Mochan
- Operation Sankat Mochan (India)
- Operation Sea Waves
- Operation Searchlight
- Operation Shady RAT
- Operation Shingle
- Operation Skorpion
- Operation Slapstick
- Operation Smiling Buddha
- Operation Sonnenblume
- Operation Steeplechase
- Operation Strangle (World War II)
- Operation Sukoon
- Operation Sundown
- Operation Surya Hope
- Operation Talwar
- Operation Torch
- Operation Trident (1971)
- Operation Trishul
- Operation Tupac
- Operation U-Go
- Operation Venezia
- Operation Vijay (1961)
- Operation Vijay (1999)
- Operation Vijay Medal
- Operation Vijay Star
- Operation Viraat
- Operation Waterfall
- Operation West End
- Operation Woodrose
- Operations Ginny I and II
- Operations Vulcan and Strike
- Operations against the Marri and Khetran tribes
- Ophir
- Ophisops agarwali
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- Ophisops kutchensis
- Ophisops leschenaultii
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- Ophisops pushkarensis
- Opindia
- Opinion polling for the 2014 Indian general election
- Opinion polling for the 2019 Indian general election
- Opinion polling for the next Indian general election
- Opinion polling on the Narendra Modi premiership
- Opium and Alkaloid Works
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- Orai railway station
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- Oraon people
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- Ordinance (India)
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- Ordre des Arts et des Lettres
- Ore
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- Ore Kadal
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- Orell Language Lab
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- Organization
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