Jusztina Szilágyi de Horogszeg, also mentioned as Ilona Szilágyi (before 1455 – 1497), was a Hungarian noblewoman, the second wife of Vlad the Impaler, Voivode of Wallachia. She was the daughter of Ladislaus or Osvát Szilágyi, thus a cousin of Matthias Corvinus, King of Hungary. Corvinus gave her in marriage to Wenceslas Pongrác of Szentmiklós. Pongrác's inherited estates were located in Upper Hungary (present-day Slovakia), but he was forced to renounce them in exchange for landed property that he and Jusztina jointly received in Transylvania. Pongrác died in 1474. The widowed Jusztina became the wife of Vlad the Impaler, whom Corvinus acknowledged as the lawful voivode of Wallachia in 1475. Vlad seized Wallachia in late 1476, but was soon murdered. To strengthen her claim to her Transylvanian estates, she married Paul Suki, who was related to the former owners of the same lands. Suki died in 1479. Two years later, Jusztina married John Erdélyi of Somkerék, who survived her.

Most details of Jusztina's early life are uncertain. According to a royal charter (which was issued in 1479), she was the daughter of Osvát Szilágyi, who was the maternal uncle of Matthias Corvinus, King of Hungary. An other document (which was written in 1496) stated that she was the daughter of Osvát's younger brother, Ladislaus. Historians András Kubinyi and Tamás Fedeles say, Jusztina was probably the daughter of Osvát and his wife, Ágota Pósa of Szer.Pál Engel and Mihai-Florin Hasan write, Ladislaus and his unknown wife were her parents.Radu Florescu (who calls her Ilona) says, she was the daughter of Michael Szilágyi (a brother of Osvát and Ladislaus).

She was born in the early 1450s, according to Hasan. Hasan also proposes that she was still an infant when her father died in 1454. Her uncle, Osvát, became her guardian, which gave rise to the confusion of her fathers.

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