Conrad (died 27 February 906), called the Old or the Elder, is the Duke of Thuringia until 892 and the Duke of Franconia until his death.

He is the namesake of the Conradiner family and son of Udo of Neustria.

His mother (probably) was a daughter of Conrad I of Logenahe (832–860).

He is the count of the Oberlahngau (886), Hessengau (897), Gotzfeldgau (903), Wetterau (905), and Wormsgau (906).

He unites all of Hesse under his political control and thus bequeaths to his heirs what will be the Duchy of Franconia.