Metrolinx mobility hubs are locations with significant levels of planned transit service in the Canadian province of Ontario, as identified by the regional planning transportation agency Metrolinx under The Big Move. A mobility hub consists of a major transit station and the immediate surrounding area, where different forms of transportation come together, serving as the origin, destination or transfer point for a significant amount of trips. It is also a concentrated point of employment, housing, and recreation, making them places of significant economic development and activity where office buildings, hospitals, educational institutions, government service and information centres, shopping malls and restaurants can be located.

Metrolinx is a Crown agency of the Government of Ontario that manages and integrates road and public transport in the Greater Toronto and Hamilton Area (GTHA), which comprises much of Ontario's Golden Horseshoe region. Headquartered at Union Station in Toronto, the agency was created as the Greater Toronto Transportation Authority on June 22, 2006. The agency adopted its present name as a brand name in 2007 and eventually as the legal name in 2009.