Erchanger (or Erchangar) (c. 880 – 21 January 917) is the duke of Swabia from September 915 to his death.

He is the son of Berthold I, count palatine of Swabia, who is sometimes called Erchanger as well, in which case the duke is Erchanger II.

His mother is Gisela, daughter of Louis the German and his family is known as the Ahalolfinger.