Sidney is a town located at the northern end of the Saanich Peninsula, on Vancouver Island in the Canadian province of British Columbia. It is one of the 13 Greater Victoria municipalities. It has a population of approximately 11,583. Sidney is located just east of Victoria International Airport, and a few kilometres south of BC Ferries' Swartz Bay Terminal. The town is also the only Canadian port-of-call in the Washington State Ferry system, with ferries running from Sidney to the San Juan Islands and Anacortes. Sidney is located along Highway 17, which bisects the town from north to south. It is generally considered part of the Victoria metropolitan area.

The town west of Highway 17 (also called the Pat Bay Highway) has a mixture of single-family residences and light industry. The majority of the town is located east of highway 17. Single-family units are also present east of the highway, but the eastern sector also has many condominium-type buildings, plus most of the service and retail outlets. The island-studded Haro Strait, part of the Salish Sea forms Sidney's eastern boundary. There is a large boating and marine industry in the area, ranging from marinas to boatbuilders and marine suppliers.