The Hers-Mort (French pronunciation: [ɛʁs mɔʁ]; Occitan: Èrs Mòrt; the "Dead Hers", as opposed to the faster-flowing Hers-Vif, or "Live Hers") is a 89.3-kilometre (55.5 mi) long river in southern France,[a] a right-bank tributary of the Garonne.

The Hers-Mort rises in the Lauragais region, near the village Fonters-du-Razès, in the Aude department.

Its waters, augmented by the Girou which flows into its right bank, irrigate the market gardens around Toulouse.

The Canal du Midi crosses the Hers-Mort near Villefranche-de-Lauragais via the Hers Aqueduct.

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