Thorncliffe Park is a densely populated, multicultural neighbourhood in central east Toronto, Ontario, Canada, in the former Borough of East York. East York merged with five other municipalities and a regional government in 1998 to form the new "City of Toronto". It is commonly considered to be bounded on the east by the Don River, on the west by Millwood Road, on the north by Wicksteed Avenue and Research Road, and on the northwest by a railway track between Millwood and Wicksteed. However, the official Community Planning Area named Thorncliffe Park includes the neighbourhood to the north of the railway tracks, east of Laird Avenue, south of Eglinton Avenue, and west of the Don River.