Class 31 may refer to:
- British Rail Class 31
- EAR 31 class
- GER Class N31
- HSH Class 31
- L&YR Class 31
- NBR Class M 4-4-0, later LNER Class D31
- No.31-class patrol boat
- Seibu Class E31
- South African Class 31-000
This disambiguation page lists articles associated with the title Class 31.
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