The Andainette (French pronunciation: [ɑ̃dɛnɛt]) is a river in the department of Orne, in the Normandy region, France.

It is a left tributary of the Varenne, thus a sub-tributary of the river Loire via the Mayenne and Maine.

[2] The valleys of the Andainette and its tributaries are protected as a Natura 2000 site called Bassin de l'Andainette.

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