File:Trans-Canada Highway, Ontario Highway 417, Ottawa, Ontario (30067220955).jpg

The Trans-Canada Highway (French: Route Transcanadienne; abbreviated as TCH or T-Can) is a transcontinental federal-provincial highway system that travels through all ten provinces of Canada from the Pacific Ocean on the west to the Atlantic on the east. The main route spans 7,821 km (4,860 mi) across the country, one of the longest routes of its type in the world. The highway system is recognizable by its distinctive white-on-green maple leaf route markers, although there are small variations in the markers in some provinces.

Throughout much of Canada, there are at least two routes designated as part of the Trans-Canada Highway (TCH). For example, in the western provinces, both the main Trans-Canada route and the Yellowhead Highway are part of the Trans-Canada system. Although the TCH, being strictly a transcontinental route, does not enter any of Canada's three northern territories or run to the Canada–US border, the Trans-Canada Highway forms part of Canada's overall National Highway System (NHS), providing connections to the Northwest Territories, Yukon and the border, although the NHS (apart from the TCH sections) is unsigned.

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