Known as Tanes in 1128, because of the tanneries in the area, it became known as Thannes then Thannes-Thennes in 1507.
The history of Thennes has always been closely linked with that of the neighbouring commune of Berteaucourt-les-Thennes.
From 780, Thennes was the property of the abbey at Corbie, later, as a fiefdom, it passed to the seigneurs of Boves, before returning to Corbie in the 13th century.
Thennes has seen more than its fair share of war:
During the 16th century against the Spanish, particularly with the siege of Corbie in 1636. Some boatmen of Thennes and Castel burned the Spanish supplies destined for their troops outside Corbie. Louis XIII subsequently exempted them and their descendants from all taxes.
During the Napoleonic wars of 1814-1815, Cossacks were seen in the commune.