OOO

OOO may refer to:

• OpenOffice.org, an office application suite
• Out-of-order execution, a paradigm in microprocessors
• Out Of Office, a day off, holidays
• Limited liability company (Russian: Общество с ограниченной ответственностью, traslit. Obshchestvo s Ogranichennoy Otvetstvennostyu), a legal form of business company in Russia and other countries
• Kamen Rider OOO
• The Land of Ooo, the setting of Adventure Time
• OOO gauge, an old UK model railway scale

O-O-O may refer to:

• Long (or queenside) castling (chess), in Portable Game Notation. The standard algebraic notation uses 0-0-0 (with figures zero instead of letters oh) instead.

See also

• 000 emergency, the primary national emergency number in Australia
• One on One (disambiguation)
• Out of Order (disambiguation)
• Three Rings Design, an online game developer
• O00, the Alturas Municipal Airport
• Order of operations