| Adelaide of Eilenburg | |
| Noble Family: | Wettin |
| Father: | Dedi I, Margrave of the Saxon Ostmark |
| Mother: | Oda of Lusatia |
| Spouse: | Ernest, Margrave of Austria |
| Issue: | Leopold II, Margrave of Austria |
| Birth Date: | 1030 |
Adelaide of Eilenburg (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.
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: