Morschwiller-le-Bas ([mɔʁʃvilɛʁ lə ba]; German: Niedermorschweiler) is a commune located in the Haut-Rhin department of Alsace in north-eastern France.

It is a part of the Mulhouse Alsace Agglomération, which serves as the inter-communal local government entity for the Mulhouse conurbation.

[3] Notably, Composer and organist Julien Koszul (1844–1927), who was the grandfather of both mathematician Jean-Louis Koszul and composer Henri Dutilleux, was born in Morschwiller-le-Bas.

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