Walmart Canada is a Canadian retail corporation and the subsidiary of U.S.-based multinational retail conglomerate Walmart. Headquartered in Mississauga, Ontario, it was founded on March 17, 1994, with the purchase of the Woolco Canada chain from the F. W. Woolworth Company.

Originally consisting of discount stores, many of Walmart Canada's contemporaries and competitors include Giant Tiger, Home Hardware, Canadian Tire, Mark's, Sport Chek, GameStop, Dollarama, Winners, HomeSense, Rossy, Staples Canada, Michaels, Pet Valu, the Great Canadian Dollar Store, Dollar Tree, and Hart Stores. Based on the success of the US format, Walmart Canada has focused on expanding Supercentres from new or converted locations, offering groceries which puts them in the same market as supermarket chains such as Loblaws, Real Canadian Superstore, Atlantic Superstore, Your Independent Grocer, No Frills, Metro, Sobeys, Foodland, Thrifty Foods, Safeway, Save-On-Foods, Country Grocer, Fairway Markets, Quality Foods, Co-op and others. Walmart is the second largest retailer in Canada by revenue.

As of October 31, 2022, Walmart Canada has 402 stores operating, including 343 supercentres and 59 discount stores in almost every province and territory except for Nunavut. Walmart Canada's principal developer and landlord is SmartCentres; other significant landlords include Riocan and First Capital Realty.

It is a participant in the voluntary Scanner Price Accuracy Code managed by the Retail Council of Canada.