Parliamentary procedure is the accepted rules, ethics, and customs governing meetings of an assembly or organization. Its object is to allow orderly deliberation upon questions of interest to the organization and thus to arrive at the sense or the will of the majority of the assembly upon these questions. Self-governing organizations follow parliamentary procedure to debate and reach group decisions, usually by vote, with the least possible friction.

In the United Kingdom, Canada, Ireland, Australia, New Zealand, South Africa, and other English-speaking countries, parliamentary procedure is often called chairmanship, chairing, the law of meetings, procedure at meetings, the conduct of meetings, or the standing orders. In the United States, it is referred to as parliamentary law, parliamentary practice, legislative procedure, rules of order, or Robert's rules of order.

Rules of order consist of rules written by the body itself (often referred to as bylaws), usually supplemented by a published parliamentary authority adopted by the body. Typically, national, state or provincial and other full-scale legislative assemblies have extensive internally written rules of order, whereas non-legislative bodies write and adopt a limited set of specific rules as the need arises.