Andrew Báthory (Hungarian: Báthory András; Polish: Andrzej Batory; 1562 or 1563 – 3 November 1599) was the Cardinal-deacon of Sant'Adriano al Foro from 1584 to 1599, Prince-Bishop of Warmia from 1589 to 1599, and Prince of Transylvania in 1599. His father was a brother of Stephen Báthory, who ruled the Polish–Lithuanian Commonwealth from 1575. He was the childless Stephen Báthory's favorite nephew. He went to Poland at his uncle's invitation in 1578 and studied at the Jesuit college in Pułtusk. He became canon in the Chapter of the Roman Catholic Diocese of Warmia in 1581, and provost of the Monastery of Miechów in 1583.
Pope Gregory XIII appointed Báthory cardinal during his visit to Rome in 1584. A year later, he was installed as coadjutor bishop of Warmia. He was in Rome again when Stephen Báthory died in 1586. Andrew was one of the candidates to succeed him in Poland and Lithuania, but Jan Zamoyski, the Chancellor of Poland, convinced him to support another candidate, Sigismund Vasa, and to demonstrate the Báthorys' claim to the crown only through nominating his minor cousin, Sigismund Báthory, Prince of Transylvania. After Sigismund Vasa was elected king in 1587, Báthory convinced his cousin's advisors to send reinforcements to Poland to fight against Maximilian of Habsburg, who also claimed the throne. Báthory became Prince-Bishop of Warmia after the death of Bishop Marcin Kromer in 1589.