The coat of arms of Ontario is the armorial emblem representing the Canadian province of Ontario. The arms contain symbols reflecting Ontario's British heritage, along with local symbols. At the upper part of the shield is the red cross of St. George, representing England. The lower portion of the shield features three golden maple leaves on a green background.

The flag of Ontario is the provincial flag of Ontario, Canada. It is a defaced Red Ensign, with the Royal Union Flag in the canton and the Ontario shield of arms in the fly. The flag of Ontario was derived from the Canadian Red Ensign, which was used as a civil ensign and as a de facto flag of Canada from the late 19th century to 1965. It was adopted in a period when many Canadian provinces adopted their own flags. May 21 is Ontario Flag Day.