Portland is a police village and unincorporated place located in the municipal township of Rideau Lakes, United Counties of Leeds and Grenville in eastern Ontario, Canada. The community is on Ontario Highway 15 about 60 kilometres (37 mi) northeast of Ontario Highway 401 at Kingston by road, and is situated in geographic Bastard Township on the southeast side of Big Rideau Lake.

Rideau Lakes is a township located within Leeds and Grenville United Counties in Eastern Ontario, Canada. The township was incorporated on 1 January 1998 by amalgamating the former townships of North Crosby, South Crosby, Bastard, South Burgess and South Elmsley with the village of Newboro.