Poix-Terron () is a commune located in the department of Ardennes, in the Grand Est (lit. "Great East") region of France.
Two villages belong to the commune: Poix, and the churchless Terron-les-Poix. Poix became Poix-Terron in 1897. Poix is located on the N51, 18 km from Charleville-Mézières, and 28 km from Rethel. Terron is located 1.5 km from Poix on the D27. The river Vence flows through the commune.
The Poix-Terron railway station is on the SoissonsâÂÂGivet railway between Reims and Charleville-Mézières. The station was reopened on 1 October 2011.
The town has suffered during religious wars: there was a fire in the village and castle in 1641, and a siege of the church on 8 July 1651. King Louis XIV passed through on 25 June and 7 August 1654.
On 30 August 1870, during the Franco-German war, the Affaire de Poix (The Poix Case, lit. "Poix Affair") occurred, involving the 42nd infantry regiment.
On 14 May 1940, a breach, 8 km in length, occurred between Poix-Terron and Baâlons in the French line of defence. A battalion of Spahis attempted to close the breach and held against the Germans in the battle of the Horgne.