Function may refer to:

• Function (biology), explaining why a feature survived selection
• Function (mathematics), an abstract entity that associates an input to a corresponding output according to some rule
• Function (engineering), related to the utility/goal of a property
• Function (computer science), or subroutine, a portion of code within a larger program, performs a specific task
• Function object, or functor or functionoid, a concept of object-oriented programming
• Grammatical function, in language studies, the purpose of a word or phrase in a sentence
• Diatonic function describes a music term
• A formal event such as a party or meeting

See also

• Functional (disambiguation)
• Functionalism (disambiguation)
• Functor
• Function hall