Louan-Villegruis-Fontaine (French pronunciation: [lwɑ̃ vilɡʁɥi fɔ̃tɛn]) is a commune in the Seine-et-Marne department in the Île-de-France region in north-central France.

The river Aubetin forms part of the commune's northern border.

Inhabitants are called Louannais.

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