Plieux (French pronunciation: [plijø]; Occitan: Plius) is a commune in the Gers department in southwestern France.

The Auroue flows north through the western part of the commune; the river Arrats forms all of the commune's eastern border.

Historical population

Year	Pop.	±%
1962	245	—
1968	232	−5.3%
1975	214	−7.8%
1982	195	−8.9%
1990	186	−4.6%
1999	174	−6.5%
2008	161	−7.5%

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• Communes of the Gers department