OU or Ou or ou may stand for:
Outlook.com is a web-based suite of webmail, contacts, tasks, and calendaring services from Microsoft.
Outlander is a British-American television drama series based on the historical time travel Outlander series of novels by Diana Gabaldon.
In business, outsourcing is "an agreement in which one company contracts-out a part of their existing internal activity to another company" .
The following outline is provided as an overview of and topical guide to geography:
An outlaw motorcycle club is a motorcycle subculture that has its roots in the immediate post-World War II era of American society.
Outkast (stylized as OutKast) is an American hip hop duo formed in 1991, in East Point, Atlanta, Georgia, composed of Atlanta-based rappers André "André 3000" Benjamin (formerly known as Dré) and Antwan "Big Boi" Patton.
The Outer Hebrides (), also known as the Western Isles (Scottish Gaelic: Na h-Eileanan Siar [nə ˈhelanən ˈʃiəɾ] or Na h-Eileanan an Iar [nəˈhelanən əˈɲiəɾ]), Innse Gall ("islands of the strangers") or the Long Isle or Long Island (Scottish Gaelic: An t-Eilean Fada), is an island chain off the west coast of mainland Scotland.