Category 1 can refer to:
- Category 1 cable, an electrical standard for communications wiring
- Category 1 tropical cyclone, on any of the Tropical cyclone scales
- Category 1 pandemic, on the Pandemic Severity Index, an American influenza pandemic with a case-fatality ratio of less than 0.1%
- Category 1 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 01 non-silicate mineral - native element minerals
See also
- Class 1 (disambiguation) - class/category equivalence (for labeling)
- Type 1 (disambiguation) - type/category equivalence (for labeling)
- Group 1 (disambiguation) - group/category equivalence (for labeling)
- Category I (disambiguation) - Roman/Arabic numbering equivalence
