Siegfried I

Siegfried I may refer to:


 * Siegfried of Luxembourg (922–998), first count of Luxembourg
 * Siegfried I, Count of Sponheim (c. 1010 – 1065)
 * Siegfried I (Archbishop of Mainz) (died 1084)
 * Siegfried I, Prince of Anhalt-Zerbst (c. 1230 – 1298)