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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
- Oohakachavadam
- Oohalu Gusagusalade
- Oohalu Gusagusalade (TV series)
- Oolampara
- Oolkatal
- Oolu
- Oomai Vizhigal
- Oomaithurai
- Oomakkuyil
- Oomakkuyil Padumbol
- Oomana Thinkal
- Oomappenninu Uriyadappayyan
- Oomerabad
- Oommen Chandy
- Oommen Mathew
- Oon Bujurg
- Oonch Neech
- Oonch Neech Beech
- Oonche Log (1965 film)
- Oonche Log (1985 film)
- Oondees
- Oonjaal
- Oopali Operajita
- Ooparwala Jaane
- Oops! (film)
- Oor Panchayathu
- Oorakam
- Oorakam Hill
- Oorakkad
- Oorantha Anukuntunnaru
- Oorantha Sankranthi
- Oorige Upakari
- Oorkavalan
- Oormakale Vida Tharu
- Oormelalagiyan
- Oorpally
- Oorpazhachi Kavu
- Ooru Vittu Ooru Vanthu
- Ooruki Monagadu
- Oorukichchina Maata
- Oorukku Oru Pillai
- Oorukku Uzhaippavan
- Ooruku Nooruper
- Oorum Unavum
- Oorum Uravum
- Oorummadi Brathukulu
- Ooruttambalam
- Oorvani
- Oorvazi Irani
- Oosaravelli
- Oothikachiya Ponnu
- Oothukadu
- Oothukkadu Venkata Kavi
- Ooti
- Ootpally
- Oottara
- Oottyppattanam
- Ootukulangara Bhagavathy Temple, Peruvemba
- Ooty
- Ooty (film)
- Ooty Golf Course
- Ooty Lake
- Ooty Municipal Market
- Ooty Racecourse
- Ooty Radio Telescope
- Ooty Varai Uravu
- Ooty bus stand
- Ooty varkey
- Ooyala (film)
- Oozham (1988 film)
- Opadometa
- Opashona Ghosh
- Opel India
- Open-defecation
- OpenAI
- OpenStreetMap
- Open (Indian magazine)
- Open Hub
- Open Minds - A Birla School
- Open Source For You
- Open Tee Bioscope
- Open University
- Open access in India
- Open architecture
- Open collaboration
- Open defecation
- 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
- 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
- Ophisops beddomei
- Ophisops kutchensis
- Ophisops leschenaultii
- Ophisops microlepis
- Ophisops nictans
- 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
- Oppam Oppathinoppam
- Oppana
- Oppanakara Street
- Oppiliappan temple
- Oppliyappan Sannadhi
- Oppol
- Opposition (parliamentary)
- Opposition (politics)
- Opposition to World War II
- Opposition to the Indo-US civilian agreement in India
- Opposition to the Partition of India
- Opposition to the partition of India
- Oprah Winfrey
- Optimized Electrotech
- Opto Circuits
- Or Iravu
- Ora Charjon
- Ora Egaro Jon
- Ora Thake Odhare
- Oraalppokkam
- Oracle Corporation
- Oracle Financial Services Software
- Oragadam
- Oragadam, Ambattur
- Orai
- Orai (Assembly constituency)
- Orai railway station
- Orakzai
- Oral Koodi Kallanayi
- Oral Mathram
- Oral storytelling
- Oral tradition
- Oral transmission
- Oram Po
- Oran, India
- Oranda, Odisha
- Orange-tufted Sunbird
- Orange (2010 film)
- Orange (2012 film)
- Orange (2018 film)
- Orange (fruit)
- Orange Line (Bhoj Metro)
- Orange Line (Jaipur Metro)
- Orange Marangalude Veedu
- Orange Mittai
- Orange Valley
- Orange Valley Tea Garden
- Orange bullfinch
- Orange chromide
- Orange tree
- Oranju Poika
- Oraon
- Oraon people
- Orathanad
- Orathanad (state assembly constituency)
- Orathanadu (Mukthambalpuram)
- Orathanadu Taluk
- Orathanadu block
- Orathuppalayam Dam
- Orathy
- Orawankara Neelakandhan Namboodiri
- Orayiram Kinakkalal
- Orb Energy
- Orba Thermal Power Station
- Orbital station-keeping
- Orbiter
- Orby Howell Mootham
- Orchha
- Orchha Fort complex
- Orchha State
- Orchid
- Orchid Enclave
- Orchidaceae
- Orchids
- Orde Wingate
- Order Order Out of Order
- Order of British India
- Order of Fiji
- Order of Gorkha Dakshina Bahu
- Order of King Abdulaziz