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Protocol is a set of guidelines for use in various circumstances. It may also refer to:

Diplomacy and politics

• Protocol (diplomacy), the etiquette of diplomacy and affairs of state
• Protocol (politics), a logbook or other artifact of a political meeting between persons from different nations
• Protocol (treaty), a treaty or international agreement that supplements a previous one

Communications and computing

• Communications protocol, a set of rules governing communication between electronic devices
• Protocol (computing), a set of rules governing communication within and between computing endpoints
• Protocol (object-oriented programming), what or how unrelated objects use to communicate with each other in object-oriented computer programs

Medical

• Guideline (medical), a protocol for medical treatment
• Clinical trial protocol, the method used in a clinical trial of a drug or medical treatment

Culture

• Protocol (film), a 1984 Hollywood movie starring Goldie Hawn
• Protocol (band), a British electropop band

Literature

• The Protocols of the Elders of Zion

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