Aitern is a small municipality located in the southwestern German federal state of Baden-Württemberg. It is situated within the district of Lörrach.
The town's name is derived from the Celtic word "aitara," which translates to flowing. This etymology is reflected in its coat of arms, which was officially granted in 1907. The blazon features a wavy blue bend between two blue rock hammers with black handles on a silver field; the wavy bend serves as an allusion to the town's name.