Category 3
# Category 3

Category 3 or Category III can refer to:

* Category 3 cable, a specification for data cabling
* British firework classification
* Category 3 tropical cyclone, on any of the tropical cyclone scales
* Category 3 pandemic, on the Pandemic Severity Index, an American influenza pandemic with a case-fatality ratio between 0.5% and 1%
* Category 3 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
* Category 03 non-silicate mineral - Halides
* Category III, a rating in the Hong Kong motion picture rating system
* Category III, a capability level of aircraft instrument landing systems
* Category III New Testament manuscripts - Eclectic
* Category III measurement - performed in the building installation
* Category III protected area (IUCN) - natural monument
