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Look up alum in Wiktionary, the free dictionary.
Alum is a species and class of chemical compound. Potassium alum, the prototypical member of the class, is often referred to simply as alum.
Alum may also refer to:
- Alum, Texas, a community in the US
- Alumnus, a graduate of a particular institution
- Alum Pot, a pothole in Simon Fell, North Yorkshire, England
- Ålum Runestones, four Viking age runestones located in Ålum, Denmark
- Robert Alum (died 1417), an English medieval bishop and university chancellor