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{{TopicTOC-Country-Sri Lanka}}This page lists Sri Lanka-related articles with titles beginning with an alphabet letter O. - O Mallige
- O Nanna Nalle
- O Premave
- O R Nizam Road
- O. K. Chinnaraj
- O. N. V. Kurup
- O. P. Ramaswamy Reddiyar
- O. Panneerselvam
- O. Panneerselvam ministry (2016–17)
- O. R. Ramachandran
- O. S. Manian
- O. S. Veluchami
- O. Subramanian
- O. Thanikachalam Chetti
- O. V. Alagesan
- O. V. Vijayan
- O. V. Vijayan Sahitya Puraskaram
- Oba Koheda Priye
- Oba Nathuwa Oba Ekka
- Obadagahadeniya
- Obadawatta
- Obaidul Huq
- Obeyesekere Walawwa
- Obra, Bihar
- Obrimona
- Ocean University of Sri Lanka
- Ocean of Pearls
- Ochlandra stridula
- Ochna lanceolata
- Ochna rufescens
- Ocimum tenuiflorum
- October 1995 Eastern Sri Lanka massacres
- Ocyale lanca
- Ocypode brevicornis
- Odahuttidavalu
- Odahuttidavaru
- Odahuttidavaru (1969 film)
- Odakalu Bimba
- Odakkuzhal Award
- Odaruthammava Aalariyam
- Odayil Ninnu
- Odayil Ninnu (film)
- Oddamavadi
- Oddamavadi Bridge
- Oddanchatram (state assembly constituency)
- Oddusuddan
- Oddusuddan Divisional Secretariat
- Oddusuddan offensive (1999)
- Odel
- Odisha State Beverage Corporation
- Odiyal
- Odiyan
- Odontotermes assmuthi
- Odontotermes escherichi
- Odontotermes koenigi
- Odontotermes redemanni
- Oduvil Unnikrishnan
- Oedignatha affinis
- Oedignatha bicolor
- Oedignatha coriacea
- Oedignatha flavipes
- Oedignatha gulosa
- Oedignatha major
- Oedignatha montigena
- Oedignatha proboscidea
- Oedignatha retusa
- Oedignatha striata
- Of the People
- Office of the Chief of Defence Staff
- Officer in charge (police)
- Officer's Choice
- Official languages of Puducherry
- Oggarane (film)
- Oggomuwa
- Ogodapola
- Ohidul Alam
- Ohileshwara
- Ohiya
- Ohiya rat
- Ohm Shanthi Oshaana
- Ohoma Harida
- Okanda
- Okandeyaya
- Okawala
- Okewela
- Okewela Divisional Secretariat
- Okewelagoda
- Okhla barrage
- Okhlee
- Oki international school
- Ola Bola
- Olagama
- Olaganduwa
- Olaganwatta
- Olan (dish)
- Olangal
- Olappamanna
- Olave Jeevana Lekkachaara
- Olave Mandara
- Olavina Aasare
- Olavina Udugore
- Olavu Geluvu
- Olavum Theeravum
- Olax zeylanica
- Old Cambrians Sports Club
- Old Colombo Dutch Hospital
- Old Colombo Lighthouse
- Old Dutch Hospital, Galle
- Old Kannada
- Old Monk
- Old Naini Bridge
- Old Nupe Market
- Old Park
- Old Parliament Building, Colombo
- Old Peradeniya
- Old Phuket Town
- Old Royal College Building, Colombo
- Old Sachdeva railway station
- Old Tamil language
- Old United States Chancery, Colombo
- Old Welekade Market
- Oli Ahad
- Oli Ahmad
- Oligama
- Oligoda
- Oligodon calamarius
- Oligodon sublineatus
- Oligolepis acutipennis
- Olios ceylonicus
- Olios greeni
- Olios hirtus
- Olios lamarcki
- Oliver Ernest Goonetilleke
- Oliver Ranasinghe
- Oliver Weerasinghe
- Oliyambukal
- Ollari language
- Oluara
- Olupeliya
- Oluvil Harbour
- Oluvil Lighthouse
- Oluwawatta
- Olympiyan Anthony Adam
- Om (1995 film)
- Om Namo (Book)
- Omalur (state assembly constituency)
- Omana and Moscow Gopalakrishnan
- Omanathinkal Kidavo
- Omanthai
- Omanthai Central College
- Omanthai railway station
- Omatta
- Omchery N. N. Pillai
- Omer Kamil
- Omesh Wijesiriwardene
- Omkara (2004 film)
- Ompok bimaculatus
- Onam
- Onapottan
- Once Upon a Time (2013 film)
- Oncosperma fasciculatum
- Ondaatje Letters
- Ondaatje Prize
- Ondagi Balu
- Ondagona Baa
- Ondanondu Kaladalli
- Onde Balliya Hoogalu
- Onde Guri
- Onde Roopa Eradu Guna
- Ondu Cinema Kathe
- Ondu Hennu Aaru Kannu
- Ondu Kshanadalli
- Ondu Motteya Kathe
- Ondu Muttina Kathe
- Ondu Premada Kathe
- One Colombo Night
- One Galle Face
- One Man Show (film)
- One Shot (2005 film)
- One Tree Hill, Sri Lanka
- One Way Ticket (2008 film)
- Onla
- Onna Babo
- Onnaman
- Onnara Vattu
- Onnum Mindathe
- Onnum Onnum Moonu (film)
- Onomastus nigricaudus
- Onomastus pethiyagodai
- Onomastus quinquenotatus
- Onomastus rattotensis
- Ontarjatra
- Onti
- Onti Salaga
- Oolkatal
- Oomakkuyil Padumbol
- Oomappenninu Uriyadappayyan
- Oondees
- Oorgai
- Oorige Upakari
- Oorum Unavum
- Oottyppattanam
- Ooty varkey
- Oozham (2016 film)
- Opalagala
- Opalgala
- Opalgalawatta
- Opalla
- Opanayaka Divisional Secretariat
- Open University of Sri Lanka
- Operation Alamelamma
- Operation Antha
- Operation Balavegaya
- Operation Checkmate (Sri Lanka)
- Operation Definite Victory
- Operation Diamond Racket
- Operation Eagle (Sri Lanka)
- Operation Garron
- Operation Jackpot Nalli C.I.D 999
- Operation Jayasikurui
- Operation Madad (Indian Navy)
- Operation Pawan
- Operation Poomalai
- Operation Rana Gosa
- Operation Riviresa
- Operation Sea Breeze (Sri Lanka)
- Operation Sumatra Assist
- Operation Thrividha Balaya
- Operation Trishul
- Operation Unified Assistance
- Operation Viraat
- Ophisops leschenaultii
- Ophisops minor
- Ophisternon bengalense
- Opisina arenosella
- Opopaea mollis
- Oppam
- Oppol
- Optional Protocol on the Involvement of Children in Armed Conflict
- Optional Protocol on the Sale of Children, Child Prostitution and Child Pornography
- Optional Protocol to the Convention on the Elimination of All Forms of Discrimination against Women
- Opuntia stricta
- Oral Mathram
- Orange (2010 film)
- Orange (2012 film)
- Orange Field Tea Factory
- Orange minivet
- Orange-billed babbler
- Orange-breasted green pigeon
- Orathanad (state assembly constituency)
- Orawankara Neelakandhan Namboodiri
- Orchestina dentifera
- Orchestina manicata
- Orchestina pilifera
- Orchestina tubifera
- Ordinary (film)
- Ordinary Magic
- Ore Thooval Pakshikal
- Orgyia postica
- Oridathoru Phayalvaan
- Oridathoru Postman
- Oridathoru Puzhayundu
- Oridathu
- Origins of North Indian and Pakistani foods
- Origins of the Sri Lankan civil war
- Orikkal Oridathu
- Orissa (film)
- Oriyan Thoonda Oriyagapuji
- Oriyardori Asal
- Orkkuka Vallappozhum
- Orma Mathram
- Ormakalil Oru Manjukaalam
- Ormakalundayirikkanam
- Ormakkayi
- Ormayude Arakal
- Ormayundo Ee Mukham
- Ornate paradisefish
- Orr's Hill Vivekananda College
- Orthaga irrorata
- Orthaga leucatma
- Orthaga rhodoptila
- Orthaga vitialis
- Orthomorpha mikrotropis
- Oru CBI Diary Kurippu
- Oru Cheru Punchiri
- Oru Desathinte Katha
- Oru Indian Pranayakadha
- Oru Kal Oru Kannadi (song)
- Oru Maravathoor Kanavu
- Oru Marubhoomikkadha
- Oru Maymasa Pulariyil
- Oru Mexican Aparatha
- Oru Minnaminunginte Nurunguvettam
- Oru Muthassi Gadha
- Oru Naal Varum
- Oru New Generation Pani
- Oru Painkilikatha
- Oru Penninte Katha
- Oru Sankeerthanam Pole
- Oru Second Class Yathra
- Oru Small Family
- Oru Theruvinte Katha
- Oru Vadakkan Selfie
- Oru Vadakkan Veeragatha
- Oru Visheshapetta Biriyani Kissa
- Oru Yathrayil
- Oruvan (2006 film)
- Oryzias carnaticus
- Oryzias dancena
- Osbeckia aspera
- Osbeckia octandra
- Oshada Fernando
- Oshadi Ranasinghe
- Oskhali
- Osmania Biscuit
- Osmania College
- Osmund Bopearachchi
- Osmund Jayaratne
- Osmund de Silva
- Ossie Abeygunasekera
- Oswald Gomis
- Oswald Leslie De Kretser II
- Oswald Leslie De Kretser III
- Oswind Suriya
- Otagama
- Otalawa
- Otara Gunewardene
- Othappu
- Othenente Makan
- Otocryptis nigristigma
- Otocryptis wiegmanni
- Otta Nanayam
- Ottaal
- Ottagathai Kattiko
- Ottakkayyan
- Ottapidaram (state assembly constituency)
- Ottayaal paatha
- Ottayal Pattalam
- Oture
- Ouija (2015 film)
- Our Lady of the Holy Rosary Cathedral
- Ouseppachan
- Out of Range (film)
- Out of Syllabus
- Outcast of the Islands
- Outer Space Treaty
- Outline of Sri Lanka
- Outram Island
- Outsider (2012 film)
- Outsourced (film)
- Ouu khatta
- Ovagiriya
- Overseas School of Colombo
- Ovilikanda
- Ovisa
- Ovitipana
- Ovvoru Pookalume
- Owala (7°16'N 80°34'E)
- Owala (7°31'N 80°39'E)
- Owalapolwatta
- Owen and Mzee
- Owen de Abrew
- Owilana
- Owilikanda
- Owilla
- Owisa
- Owitigamuwa
- Owitipana
- Oxyopes ceylonicus
- Oxyopes juvencus
- Oxyopes nilgiricus
- Oxyopes rufisternis
- Oxyptilus epidectis
- Oxytate subvirens
- Oxytate taprobane
- Oyatenna
- Oyyarathu Chandu Menon
- Ozhivukaalam
- Oziotelphusa ceylonensis
- Oziotelphusa hippocastanum
- Oziotelphusa ritigala
- Oziotelphusa stricta
{{Expand list|date=December 2017}} See also - Index of Sri Lanka-related articles
{{Index footer}} 1 : Sri Lanka-related lists |