The Roncesvalles Carhouse is a storage and maintenance facility for the streetcar network of the Toronto Transit Commission. Located at the northwest corner of The Queensway and Roncesvalles Avenue in Toronto, Ontario, west of its downtown core, it is the oldest of the TTC's three active carhouses. The carhouse serves vehicles on routes 501 Queen, 504 King, 505 Dundas, 506 Carlton, 511 Bathurst, and 512 St. Clair.