Adelaide of Eilenburg (c. 1030 – 26 January 1071) was a German noblewoman. She was a daughter of Margrave Dedi I of the Saxon Eastern March and his first wife, Oda of Lusatia.

Adelaide of Eilenburg
Born1030
Died(1071-01-26)26 January 1071
Noble familyWettin
Spouse(s)Ernest, Margrave of Austria
IssueLeopold II, Margrave of Austria
FatherDedi I, Margrave of the Saxon Ostmark
MotherOda of Lusatia

In 1060, she married Margrave Ernest of Austria during his reign and became Margravine of Austria. He was a member of the House of Babenberg; she was his first wife. Adelaide and Ernest had four children:

  • Leopold II (d. 1095)
  • Adalbert I, Count of Pernegg (d. 1100)
  • a daughter, who married Count Herman I of Poigen
  • Justitia, married Count Otto II of Dießen-Wolfratshausen