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- Oaths of Strasbourg842 military alliance made by the kings of East and West Francia
- Odia languageIndo-Aryan language
- Official languages of the United NationsThere are six official languages used in United Nations (UN) meetings and in which the UN
- Official scripts of IndiaOfficially mandated writing systems in India
- Oghuz languagesSub-branch of the Turkic language family
- Oksapmin languageOksapmin is a Trans–New Guinea language spoken in Oksapmin Rural LLG, Telefomin District,
- Old ArabicEarliest stage of the Arabic language before Islam
- Old AramaicEarliest stage of the Aramaic language
- Old EnglishEarliest historical form of English language
- Old English Latin alphabetAlphabet used from 7th to 12th centuries
- Old KhmerOldest stage of the Khmer language
- Old LatinLatin language in the period before 70 BC
- Old PersianOld Iranian language
- Old Persian (horse)Old Persian (foaled 14 March 2015), is a British-bred Thoroughbred racehorse who has raced
- Old Persian cuneiformSemi-alphabetic cuneiform script
- Old Turkic scriptAlphabet used by early Turks (8–10th centuries)
- Omani ArabicVariety of Peninsular Arabic spoken in Oman
- Ongin inscriptionThe Ongin inscription was discovered in 1891 in Mongolia near the Ongi River, 160 km south
- Orang AsliIndigenous ethnic groups of Malaysia
- Ordinance of Villers-CotterêtsStatute that mandated the use of French for all legal actions
- Origin of languageRelationship between language and human evolution
- Oromo languageCushitic language
- OrthographySet of conventions for written language