| Frozza Orseolo | |
| Spouse: | Adalbert, Margrave of Austria |
| Issue: | Ernest, Margrave of Austria |
| Father: | Otto Orseolo |
| Mother: | Grimelda of Hungary |
| Birth Date: | 1015 |
| Birth Place: | Venice, Republic of Venice |
| Death Date: | 17 February 1071 |
Frozza Orseolo (1015 – 17 February 1071) was a Margravine of Austria by marriage to Adalbert, Margrave of Austria. She was also a member of the Venetian House of Orseolo.
Frozza was born in Venice as a daughter of Doge Otto Orseolo and his wife, Princess Grimelda of Hungary.[1]
Her father, grandfather, and great-grandfather were all Doges of Venice, and were members of the House of Orseolo, whose ancestors were the first historical Doges of Venice, the Ipatos.[2]
Her brother was Peter the Venetian, King of Hungary[3] and she was possibly a sister-in-law of Judith of Schweinfurt.
She married Adalbert, Margrave of Austria, of the House of Babenberg, and later took the name of Adelheid. They had 2 sons: Leopold & Ernest, Margrave of Austria.[4]