The strength and vitality of the many neighbourhoods that make up Toronto, Ontario, Canada has earned the city its unofficial nickname of "the city of neighbourhoods." There are 140 neighbourhoods officially recognized by the City of Toronto and upwards of 240 official and unofficial neighbourhoods within the city's boundaries. Before 1998, Toronto was a much smaller municipality and formed part of Metropolitan Toronto. When the city amalgamated that year, Toronto grew to encompass the former municipalities of York, East York, North York, Etobicoke, and Scarborough. Each of these former municipalities still maintains, to a certain degree, its own distinct identity, and the names of these municipalities are still used by their residents, sometimes for disambiguation purposes. The area known as Toronto before the amalgamation is sometimes called the "old" City of Toronto, "Toronto proper", the Central District or simply "Downtown".
The "former" City of Toronto is, by far, the most populous and dense part of the city. It is also the business and administrative centre of the city. The uniquely Torontonian bay-and-gable housing style is common throughout the former city.
The "inner ring" suburbs of York and East York are older, predominantly middle-income areas, and ethnically diverse. Much of the housing stock in these areas consists of old pre-World War II single-family houses and post-war high-rises. Many of the neighbourhoods in these areas were built up as streetcar suburbs and contain many dense and mixed-use streets, some of which are one-way. They share many characteristics with sections of the "old" city, outside of the downtown core.
The "outer ring" suburbs of Etobicoke, Scarborough, and North York are much more suburban in nature (although these boroughs are developing urban centres of their own, such as North York Centre around Mel Lastman Square). The following is a list of the more notable neighbourhoods, divided by the neighbourhoods' location based on the former municipalities, the names of which are still known and commonly used by Torontonians.