Parliamentarian can refer to a member or supporter of a Parliament, as in:

  • Member of Parliament
  • Roundheads, supporters of the parliamentary cause in the English Civil War

Parliamentarian can also refer to an expert adviser on parliamentary procedure, as in:

  • Parliamentarian (consultant) - An officer or outside consultant designated by an organization to serve as an expert in parliamentary procedure
  • Parliamentarian of the United States House of Representatives
  • Parliamentarian of the United States Senate
  • A member of the National Association of Parliamentarians
  • A member of the American Institute of Parliamentarians
  • An official of the National Forensic League, who regulates a chamber of Student Congress