Siegfried (died 3 December 937) was the Count and Margrave of Merseburg from an unknown date before 934 until his death.
Siegfried was probably the son of Thietmar, the tutor of Henry I of Germany.
Otto I put his younger brother Henry under the "protective custory" of Siegfried (or perhaps in Bavaria) during his coronation festivities.
[3] Siegfried's first wife was Ermenburg (Irminburg), daughter of Otto I, Duke of Saxony, and Hathui.
His second wife (936) was Guthia (Guhtiu), who as a widow became the foundress and first abbess of Gröningen.