Plomion (French pronunciation: [plɔmjɔ̃]) is a commune in the Aisne department in Hauts-de-France in northern France.

Plomion was the site of a massacre by retreating German forces on the evening of August 31, 1944 as the American army approached pushing toward the Belgian border.

Sixty German Waffen SS members who had been quartered in the village for six days, murdered fourteen men rounded-up at random and shot them with machine guns after lining them up in a meadow prior to retreating.

Five men from a single family were dragged from their home during supper.

After murdering the men, they set part of the town on fire.