The Bay Adelaide Centre is an office complex in the Financial District of Toronto, Ontario, Canada. The first phase, a 51-storey skyscraper known as Bay Adelaide West, was completed in July 2009. The second phase, the 44-story Bay Adelaide East, was completed in October 2016. A third tower, Bay Adelaide North, is planned.

Upon completion, the Bay Adelaide Centre will consist of three towers.

The first tower, Bay Adelaide West, was completed in 2009 with a floor area of 108,000 square metres (1,160,000 sq ft) and a height of 218 metres (715 ft) or 51 storeys. It is located on the northeast corner of Bay Street and Adelaide Street West.

The second tower, Bay Adelaide East, has a floor area of 91,045 square metres (980,000 sq ft) and a height of 44 storeys. Located mid-block between Adelaide Street West and Temperance Street, the tower has a 6-storey podium extending to the northwest corner of Yonge Street and Adelaide Street West.

The future Bay Adelaide North is anticipated to have a floor area of approximately 46,450 square metres (500,000 sq ft) and a height of 28 to 32 storeys. Unlike the two other towers in the complex, the north tower will be located on the north side of Temperance Street, with frontage along Richmond Street West. The Bay Adelaide North site is currently occupied by a one-storey elevator lobby which provides access to the underground concourse and garage.

The towers of the Bay Adelaide Centre are connected by an underground concourse, which extends under Temperance Street, and is connected to the PATH network. The underground concourse has PATH connections to Scotia Plaza to the south and Hudson's Bay Queen Street to the north. There is also a four-level underground garage under the complex, with vehicular access from both Adelaide Street West and Richmond Street West.

There is a 0.2-hectare (0.49-acre) public space, Arnell Plaza, located between Bay Adelaide West and Bay Adelaide East. Although Arnell Plaza is privately owned, public access has been legally secured by the City of Toronto. Cloud Gardens, a 0.24-hectare (0.59-acre) public park, is located immediately to the east of the Bay Adelaide North site on land conveyed to the City of Toronto as a condition of the original development approvals for the complex.

The complex's mechanical facilities are located in a four-storey above-grade building on the southwest corner of Yonge and Temperance Streets, with retail uses to be constructed at grade as part of the Bay Adelaide East construction. In order to accommodate the construction of the Bay Adelaide East podium, the historic facades of the former Elgin Block, constructed in 1850 and 1910 and once occupied by Holt Renfrew, were disassembled, refurbished and reconstructed as the facade of the mechanical facility building.

Both Bay Adelaide West and Bay Adelaide East are designed in a modernist style, although the historic north and west facades of the former National Building at the corner of Bay and Temperance Streets, completed in 1926, has been incorporated into Bay Adelaide West.

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