Parliamentary procedure is the body of rules, ethics, and customs governing meetings and other operations of clubs, organizations, legislative bodies, and other deliberative assemblies. It is part of the common law originating primarily in the practices of the House of Commons of the Parliament of the United Kingdom, from which it derives its name.

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

At its heart is the rule of the majority with respect for the minority. Its object is to allow deliberation upon questions of interest to the organization and to arrive at the sense or the will 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.