OU or Ou or ou may stand for:
Outlook.com is a web-based suite of webmail, contacts, tasks, and calendaring services from Microsoft.
Outsourcing is an agreement in which one company hires another company to be responsible for a planned or existing activity that is or could be done internally.It often involves the contracting of a business process (e.g., payroll processing, claims processing), operational, and/or non-core functions, such as manufacturing, facility management, call center support).
Outlander is a drama television series based upon author Diana Gabaldon's historical time travel book series of the same name.
An outlaw motorcycle club, also known as a biker gang, is a motorcycle subculture that has its roots in the immediate post-World War II era of North American society.
Our Gang (later known as The Little Rascals or Hal Roach's Rascals) is a series of American comedy short films about a group of poor neighborhood children and their adventures.
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 the Long Island (Scottish Gaelic: An t-Eilean Fada), is an island chain off the west coast of mainland Scotland.