Saint-Louis-du-Ha! Ha! is a parish municipality in the Témiscouata Regional County Municipality in Quebec, near the south shore of the Saint Lawrence River in Canada. It is located southeast of Rivière-du-Loup and west of Cabano along the Trans-Canada Highway (Route 185), about halfway to Edmundston in New Brunswick. The Commission de toponymie du Québec asserts that the parish's name refers to nearby Lake Témiscouata, the sense of haha here being an archaic French word for an unexpected obstacle or abruptly ending path, The Louis may refer to Louis Marquis, one of the first colonists of the region, or Louis-Antoine Proulx, vicar of Rivière-du-Loup, or perhaps the abbot Louis-Nicolas Bernier. Saint-Louis-du-Ha! Ha! is the only town in the world with two exclamation points in its name.

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