Region 4

Region 4 or Region IV can refer to:


 * One of the DVD region codes
 * Region 4, Northwest Territories (Canadian census)
 * The West of the US (one of four regions of the US census)
 * One of the health regions of Canada managed by Vitalité Health Network
 * Former Region 4 (Johannesburg), an administrative district in the city of Johannesburg, South Africa, from 2000 to 2006
 * One of the Regions of Iran
 * Coquimbo Region, Chile
 * Southern Tagalog, Philippines
 * Calabarzon, Philippines