Saint-Louis-du-Ha! Ha! is a parish municipality in the Témiscouata Regional County Municipality of the Bas-Saint-Laurent region of Quebec. The population is 1,311. Its economy is mainly agricultural. It is located southeast of Rivière-du-Loup and west of Cabano along the Trans-Canada Highway, about halfway to Edmundston in New Brunswick.

The Trans-Canada Highway is a transcontinental federal–provincial highway system that travels through all ten provinces of Canada, from the Pacific Ocean on the west coast to the Atlantic Ocean on the east coast. The main route spans 7,476 km (4,645 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.