Route 57 Courtneypark is a Mississauga Transit route. Service is provided in weekday peak periods between Meadowvale Town Centre and Islington Subway Station, travelling along Derry Road, Mavis Road, Courtneypark Drive, Convair Drive, Highway 427 and Dundas Street.
- September 3, 2012 - Route becomes accessible.
- September 5, 2005 - Route extended to Meadowvale Town Centre via Mavis Road and Derry Road.
- Prior to September 5, 2005 - Route operates only to Courtneypark Drive and Hurontario Street.
- 57N COURTNEYPARK ~ 57 TO MEADOWVALE ~ 57 VIA INFIELD
- 57S COURTNEYPARK ~ 57 TO SUBWAY ~ 57 VIA INFIELD