Subclass could mean:
- Subclass (biology), a taxonomic rank intermediate between class and superorder
- Subclass (computer science), a class that is derived from another class or classes
- Subclass (database theory), a class which inherits its data members and methods of their superclasses
- Subclass (set theory), a class contained in some other class in the same way that a subset is a set contained in some other set
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