Highway 1 is a provincial highway in British Columbia, Canada, that carries the main route of the Trans-Canada Highway (TCH). The highway is 1,047 kilometres (651 mi) long and connects Vancouver Island, the Greater Vancouver region in the Lower Mainland, and the Interior. It is the westernmost portion of the main TCH to be numbered "Highway 1", which continues through Western Canada and extends to the Manitoba–Ontario boundary. The section of Highway 1 in the Lower Mainland is the second-busiest freeway in Canada, after Ontario Highway 401 in Toronto.

The British Columbia Interior, popularly referred to as the BC Interior or simply the Interior, is a geographic region of the Canadian province of British Columbia. While the exact boundaries are variously defined, the British Columbia Interior is generally defined to include the 14 regional districts that do not have coastline along the Pacific Ocean or Salish Sea, and are not part of the Lower Mainland. Other boundaries may exclude parts of or even entire regional districts, or expand the definition to include the regional districts of Fraser Valley, Squamish–Lillooet, and Kitimat–Stikine.