Mackenzie King Bridge, Transit bridge in Ottawa, Canada

The Mackenzie King Bridge is a transit bridge spanning the Rideau Canal in downtown Ottawa, carrying multiple lanes of traffic and dedicated bus stops. It links different parts of the city center and provides passage between major public areas and government buildings.

The bridge was built in 1951 as part of Ottawa's mid-century urban development. A major renovation in the 1990s updated its structure and improved its role in the city's transportation network.

The bridge is named for William Lyon Mackenzie King (1874–1950), Canada's longest-serving prime minister. It was originally to be named after Colonel John By, the founder of Bytown, but Solon Low suggested honouring King instead, and that name was adopted when the bridge opened in 1951.

The bridge is open daily and offers a direct route through downtown for vehicles, buses, and pedestrians. Visitors should expect traffic during peak hours and can use nearby bus stops for convenient connections to other parts of the city.

The bridge was first planned to be named after Colonel John By, but Solon Low suggested naming it for William Lyon Mackenzie King instead, and that suggestion was followed. King, who lived from 1874 to 1950, was Canada's longest-serving prime minister.