Victoria Day (in French: Fête de la Reine) is a federal Canadian public holiday celebrated on the last Monday before May 25, in honour of Queen Victoria's birthday. The date is also, simultaneously, that on which the current reigning Canadian sovereign's official birthday is recognized. It is sometimes informally considered as marking the beginning of the summer season in Canada.

The holiday has been observed since before Canada was formed, originally falling on the sovereign's actual birthday, and continues to be celebrated in various fashions across the country on the fixed date; the holiday has always been a distinctly Canadian observance. It is a statutory holiday federally, as well as in six of Canada's ten provinces and all three of its territories. In Quebec, the same day was, since the Quiet Revolution, unofficially known as Fête de Dollard until 2003, when provincial legislation officially named the same date as Victoria Day the National Patriots' Day.

The birthday of Queen Victoria was a day for celebration in Canada long before Confederation, with the first legislation regarding the event being in 1845 passed by the parliament of the Province of Canada to officially recognize May 24 as the Queen's birthday. It was noted that on that date in 1854, the 35th birthday of Queen Victoria, some 5,000 residents of Canada West gathered in front of Government House (near present day King and Simcoe Streets in Toronto) to "give cheers to their queen." On May 24, 1866, the town of Omemee, also in Canada West, mounted a day-long fête to mark the occasion, including a gun salute at midnight, pre-dawn serenades, picnics, athletic competitions, a display of illuminations, and a torch-light procession; such events were common around the colony and, by the 1890s, the day had become a "patriotic holiday".