O curas hominum! O quantum est in rebus inane! - Ah, human cares! Ah, how much futility in the world! (Lucilius)

　　O di immortales! - Good heavens! (uttered by Cicero on the Senate floor)

　　O diem praeclarum! - Oh, what a beautiful day!

　　O praeclarum custodem ovium lupum! - An excellent protector of sheep, the wolf! (Cicero)

　　O quam cito transit gloria mundi! - O how quickly passes the glory of the world!

　　O sancta simplicitas! - Oh, holy simplicity! (Jan Hus)

　　O tempora, O mores! - Oh, the times! Oh, the morals! (Cicero)

　　O! Plus! Perge! Aio! Hui! Hem! - Oh! More! Go on! Yes! Ooh! Ummm!

　　Obesa cantavit - The fat lady has sung

　　Obiit (ob.) - He/she died

　　Obiter (ob.) - In passing

　　Obiter dictum - Something said in passing - parenthetical remark

　　Oblitus sum perpolire clepsydras! - I forgot to polish the clocks!

　　Obscurum per obscurius - The obscure by means of the more obscure

　　Obsta principiis - Resist the beginnings - Nip it in the bud

　　Occasio aegre offertur, facile amittitur - Opportunity is offered with difficulty, lost with ease. (Publius Syrus)

　　Occasio facit furem - Opportunity makes a thief

　　Oderint dum metuant - Let them hate provided that they fear. (Seneca)

　　Odi et amo - I hate (her), and I love (her) (Catullus)

　　Odium theologicum - Theological hatred. (a special name for the hatred generated in theological disputes)

　　Olevm addere camino - To pour fuel on the stove adding gasoline to a fire

　　Olevm perdisti - You have lost oil you've wasted your time on this criticism for a misallocation of resources

　　Olim habeas eorum pecuniam, numquam eam reddis: prima regula quaesitus - Once you have their money, you never give it back: the 1st rule of acquisiton

　　Olim - Formerly

　　Omne ignotum pro magnifico est - We have great notions of everything unknown. (Tacitus)

　　Omne initium est difficile - Every beginning is difficult

　　Omne trium perfectum - Everything that comes in threes is perfect

　　Omne tvlit pvnctvm qvi miscvit vtile dvlci - [he] has gained every point who has combined [the] useful [with the] agreeable

　　Omnes aequo animo parent ubi digni imperant - All men cheerfully obey where worthy men rule. (Syrus)

　　Omnes deteriores svmvs licentia - Too much freedom debases us

　　Omnes lagani pistrinae gelate male sapiunt - All frozen pizzas taste lousy

　　Omnes una manet nox - The same night awaits us all. (Horace)

　　Omnes vulnerant, ultima necat - All (hours) wound, the last kills. (inscription on solar clocks)

　　Omnia iam fient quae posse negabam - Everything which I used to say could not happen will happen now. (Ovid)

　　Omnia mea mecum porto - All that is mine, I carry with me. (My wisdom is my greatest wealth) (Cicero)

　　Omnia mihi lingua graeca sunt - It's all Greek to me

　　Omnia mors aequat - Death equals all things

　　Omnia munda mundis - Everything is pure to pure ones

　　Omnia mutantur nos et mutamur in illis - All things change, and we change with them

　　Omnia mutantur, nihil interit - Everything changes, nothing perishes. (Ovid)

　　Omnia mutantur, nos et mutamur in illis - All things are changing, and we are changing with them

　　Omnia vincit amor - Love conquers all

　　Omnia vincit amor; et nos cedamus amori - Love conquers all things; let us too surrender to love. (Vergil)

　　Omnium gatherum - Assortment

　　Omnium rerum principia parva sunt - Everything has a small beginning. (Cicero)

　　Onus probandi - The burden of proof

　　Opere citato (op. cit.) - In the work just quoted

　　Optimis parentibus - To my excellent parents. A common dedication in a book

　　Optimus magister, bonus liber - The best teacher is a good book

　　Opus Dei - The work of God

　　Ora et labora - Pray and work. (St. Benedict)

　　Ora pro nobis - Pray for us

　　Oratvr fit, poeta nascitvr - An orator is made [but] a poet is born

　　Orbes volantes exstare - Flying saucers are real

　　Orbiter dictum/dicta - Said by the way (miscellaneous remarks)

　　Orcae ita - Pretty straightforward

　　Ore rotundo - With full voice

　　Osculare pultem meam! - Kiss my grits!

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