Operation may refer to: - Scientific operation
- Surgery, or operation
- An operation or operator in mathematics (see unary operation, binary operation, arity)
- In language, an operation is a word which represents a function (or instruction), rather than a term or name
- In computer science, an operation is called an instruction
- Military operation, a military action (usually in a military campaign) using deployed forces
- Covert operation, a clandestine military or political action
- Sting operation, an operation designed to catch a person committing a crime, by means of deception
- Business operations, manufacturing operations, operations management
- Operations support system used in the telecommunications industry
- Operation of law, a legal term that indicates that a right or liability has been created for a party
- Anomalous operation, in parapsychology, a term describing a broad category of purported paranormal effects
- Musical operations such as transposition, inversion, multiplication, permutation, counterpoint
- Operation (game), a battery-operated game of physical skill
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