Category 4

Category 4 or Category IV may refer to:


 * Category 4 cable, a cable that consists of four unshielded twisted-pair wires
 * Category 4 fireworks, British fireworks that are for sale only to professionals
 * Category 4 tropical cyclone, on any of the Tropical cyclone scales
 * Any of several hurricanes listed at list of Category 4 Atlantic hurricanes or list of Category 4 Pacific hurricanes
 * Category 4 pandemic, on the Pandemic Severity Index, an American influenza pandemic with a case-fatality ratio between 1% and 2%
 * Category 4 winter storm, on the Northeast Snowfall Impact Scale and the Regional Snowfall Index
 * Any of several winter storms listed at list of Northeast Snowfall Impact Scale winter storms and list of Regional Snowfall Index Category 4 winter storms
 * Category 04 non-silicate mineral - oxides
 * Category four stadium, a football stadium of the highest quality as ranked by the UEFA
 * Category IV New Testament manuscripts - Western
 * Category IV measurement - performed at the source of the low-voltage installation
 * Category IV vintage car condition - Very good
 * Category IV Armed Forces Qualification Test scores - 10-30 (further subdivided)
 * Category IV protected area (IUCN) - Habitat/Species Management Area