Lanfredus (Latinised from Lantfrid or Lanfred) (died 730) was duke of Alamannia under Frankish sovereignty from 709 until his death. He was the son of duke Cotefredus. Lanfredus's brother was Theudebald.
Following Cotefredus's death in 709 and the accession of Lanfredus and his brother Theudebald, the Frankish maior domus Pepin of Herstal invaded Alamannia and fought against yet another duke, Willehari, whose territory was restricted to the Ortenau in western Alamannia. This campaign can be seen as an attempt by Pepin to impose royal authority on the duchy following the death of Cotefredus and also to assert his right to influence or even control the succession within the duchy. Pepin’s campaign against Willehari might therefore have taken place to assist Lanfredus and Theudebald in their claim to the duchy. However, both Lanfredus and Theudebald were hostile to Pepin’s successor.
