René Marc Jalbert was a retired Canadian Forces officer and sergeant-at-arms of the National Assembly of Quebec, known for his role in ending Denis Lortie's killing spree in the Parliament Building on 8 May 1984. Later he was Usher of the Black Rod for the Parliament of Canada.

A serjeant-at-arms or sergeant-at-arms is an officer appointed by a deliberative body, usually a legislature, to keep order during its meetings. The word "serjeant" is derived from the Latin serviens, which means "servant". Historically, serjeants-at-arms were armed men retained by English lords and monarchs, and the ceremonial maces which they are associated with were originally a type of weapon.