In the world of George Orwell's Nineteen Eighty-Four, The Party which controls Oceania is split into two halves: the Inner Party and the Outer Party.

The Inner Party represents the aristocratic political class in Oceania, and live in splendor unimaginable by the proles or Outer Party members. Inner Party members are always identified by their black overalls. Members are selected at a young age according to a barrage of tests, and not family heritage (any loyalty to anything other than The Party and Big Brother, including families, is strongly discouraged).

In the novel, O'Brien is the only character we meet who is a member of the Inner Party.

Goldstein's book explains the rationale behind the class divisions in Oceania.