The Royal 22nd Regiment is an infantry regiment of the Canadian Army. Known colloquially in English as the Van Doos or in French as le Vingt-deuxième, the mostly francophone regiment comprises three Regular Force battalions, two Primary Reserve battalions, and a band, making it the largest regiment in the Canadian Army. The headquarters of the regiment is at the Citadelle of Quebec in Quebec City, also the site of the regimental museum, and all three of its regular battalions are stationed at Canadian Forces Base Valcartier in Saint-Gabriel-de-Valcartier, 15 kilometres (9.3 mi) outside of Quebec City. The regiment is a "British-style" infantry regiment that is the spiritual home and repository of customs and traditions for a number of battalions that do not necessarily serve together operationally. It serves as the "local" infantry regiment for the province of Quebec, where it draws most of its recruits; it is the largest regiment in the province, in terms of numbers.

The Citadelle of Quebec, also known as La Citadelle, is an active military installation and the secondary official residence of both the governor general of Canada and the Canadian monarch. It is located atop Cap Diamant, adjoining the Plains of Abraham in Quebec City, Quebec. The citadel forms part of the fortifications of Quebec City, which is one of only two cities in North America still surrounded by fortifications, the other being Campeche, Mexico.