Category 4
Category 4 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 hurricane, a hurricane in the second-most-intense category on the Saffir–Simpson Hurricane Scale
- Category 4 influenza pandemic, an American influenza pandemic with a case-fatality ratio between 1% and 2%
- Category four stadium, a football stadium of the highest quality as ranked by the UEFA
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