Victoria Day is a federal public holiday celebrated on the last Monday before May 25, in honor 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 in Canada since at least 1845.
Canada is the only country that commemorates Queen Victoria with an official holiday. Federal government protocol dictates that, on Victoria Day, the Royal Union Flag is to be flown from sunrise to sunset at all federal government buildings— where a second flag pole exists, as the Royal Union Flag can never displace the Canadian flag.