O', O’, O`, O´, O‘ or Oʻ may refer to:

• the anglicized variant of the patronymic term "Ó" in Irish names (like in O'Sullivan)
• short for "of" or "on" (like in Pot o' Gold, John o' Groats or o'clock)
• a misspelling of the letter "O" with a diacritic like Ó, Ò, or Ơ.
• Oʻ, the twenty-fifth letter of the Uzbek alphabet
• O′ (with prime symbol) represents the glottalized or creaky vowel "/o̰/" in Taa language
• ’O or ’o is the masculine singular article in Neapolitan (as in ’O sole mio "my sunshine")

• ’ (apostrophe)
• ` (grave accent)
• ´ (acute accent)
• ‘ (quotation mark)
• ′ (prime symbol)
• All pages with titles beginning with O'
• All pages with titles beginning with O’
• All pages with titles beginning with O`
• All pages with titles beginning with O‘
• All pages with titles beginning with O´
• All pages with titles beginning with Ó
• All pages with titles beginning with 'O
• O (disambiguation)