Region 4 or Region IV may refer to:

Government

  • Region 4, Northwest Territories, a Statistics Canada census division
  • Coquimbo Region, an administrative region of Chile which was historically named Region IV
  • Southern Tagalog (designated as Region IV), an administrative region in the Philippines
  • Calabarzon (designated as Region IV‑A), an administrative region in the Philippines
  • Former Region 4 (Johannesburg), an administrative district in the city of Johannesburg, South Africa, from 2000 to 2006
  • One of the Regions of Iran

Technology

  • DVD region 4, one of the DVD regions