Ballon-Saint Mars (French pronunciation: [balɔ̃ sɛ̃ maʁ]) is a commune in the department of Sarthe, western France.

The municipality was established on 1 January 2016 by merger of the former communes of Ballon and Saint-Mars-sous-Ballon.

[3] The creation of the new commune of «Ballon-Saint Mars» was decided by a vote of the municipal councils of the communes of Ballon and Saint-Mars-sous-Ballon on 25 June 2015, after several months of negotiations.

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