Old Toronto is an administrative district and the retronym of the area within the original city limits of Toronto, Ontario, Canada, from 1834 to 1998. It was first incorporated as a city in 1834, after being known as the town of York, and became part of York County.
In 1954, it became the administrative headquarters for the Municipality of Metropolitan Toronto. The city expanded in size by annexation of surrounding municipalities, reaching its final boundaries in 1967. Finally, in 1998, it was amalgamated with the other cities of Metropolitan Toronto; and the borough of East York, into the present-day city of Toronto. It was not a traditional annexation of the surrounding municipalities in which a city absorbs the said municipalities but officially remains the same city, but it was rather a new municipal entity that is the successor of the original city.
Historically, "Old Toronto" referred to Toronto's boundaries before the Great Toronto Fire of 1904, when much of city's development was to the east of Yonge Street. Since the amalgamation, the former city is variously referred to as the "former city of Toronto" or "Old Toronto."