| Shakespearean baby names begining from O |
| Oberon |
 | 'A Midsummer Night's Dream' King of the Fairies. |
| Octavia |
 | 'Antony and Cleopatra'. Sister to Caesar and wife to Mark Antony. |
| Octavius |
| 'Antony and Cleopatra'. Octavius Caesar, Roman triumvir. 'The Tragedy of Julius Caesar' Triumvir after Caesar's death, later Augustus Caesar, first emperor of Rome. |
| Oliver |
| 'As You Like It' Son of Sir Rowland de Boys. 'As You Like It' Sir Oliver Martext, a vicar. |
| Olivia |
| 'Twelfth Night', also called 'What You Will' A rich countess. |
| Ophelia |
| 'Hamlet, Prince of Denmark' Daughter to Polonius. |
| Orleans |
| 'King Henry V' Duke of Orleans. |
| Orsino |
| 'Twelfth Night', also called 'What You Will' Orsino, Duke of Illyria. |
| Oswald |
| 'Tragedy of King Lear' Steward to Goneril. |
| Othello |
| 'The Tragedy of Othello, Moor of Venice' Othello, the Moor, general of the Venetian forces. |
| Overdone |
| 'Measure for Measure' Mistress Overdone, a bawd. |
| Oxford |
| 'King Henry the Sixth, Part III' Earl of Oxford. 'King Richard III' Earl of Oxford. |
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