| Barbara Aleksandrówna | |
| Succession: | Duchess of Warsaw |
| Reign: | Between 1440 and 1443 - 10 September 1454 |
| Reign-Type: | Tenure |
| Birth Date: | c. 1428 |
| Death Date: | between 1488 and 1492 |
| Burial Place: | Nowe Miasto, Płońsk County |
| Spouse: | Bolesław IV of Warsaw |
| Issue: | Bolesław Janusz Konrad III Rudy Bolesław Casimir III of Płock Janusz Anna Sophia Bolesław V of Warsaw Janusz II of Płock |
| House: | Gediminid |
| Father: | Alexander Włodzimierzowic |
| Succession1: | Regent of Czersk, Liw, Warsaw, Nur, Łomża, Ciechanów, Różan, Zakroczym, and Wyszogród |
| Reign1: | 1458 - 1462 |
| Predecessor1: | Anna Feodorovna of Ratnie |
| Successor1: | Konrad III Rudy |
Barbara Aleksandrówna[1] (c. 1428 between 1488 and 1492) was a princess and wife of prince Bolesław IV of Warsaw. She was the daughter of Alexander Włodzimierzowic, Grand Prince of Kiev.
Between 1440 and 1443 she married Bolesław IV of Warsaw.[2] Her husband died on September 10, 1454.[3] After death of her mother-in-law in 1458 she became a regent in the name of her minor sons Konrad III, Bolesław V, Kazimierz III, and Janusz II.[4] She usually entitled herself ducissa et gubernatrix Mazouie etc.[4]
She was buried in Nowe Miasto, Płońsk County.