Frederick II, Count of Diessen

Frederick II
Count of Dießen
Born1005 (1005)
Died1075 (aged 69–70)
St. Blaise Abbey
BuriedSeeon Abbey
Noble familyHouse of Andechs
SpousesHadamut of Eppenstein
Irmgard of Gilching
Tuta of Regensburg
FatherFrederick of Dießen
MotherHemma of Swabia

Frederick II of Dießen (also known as Frederick I of Regensburg; 1005 – 1075) was a German nobleman. He is documented as bailiff (Vogt) of the Regensburg cathedral chapter in 1035. He is one of the earliest known ancestors of the Counts of Andechs.