Jacoba of Loon-Heinsberg was a noble woman from the Low Countries who in 1446 became the abbess of Thorn Abbey. She was the daughter of John II of Loon and her half-brother, Jan van Heinsberg, was bishop of the Prince-Bishopric of Liège. She withdrew to the Convent of Bethany in Mechelen in 1455; her 1468 will indicates she left a printing press to the convent.