Joanna de Hertoghe (c. 1566–1630) was an abbess of the Cistercian Oosteeklo Abbey in Ghent.
Joanna was the daughter of Cornelis de Herthoghe, esquire, alderman and treasurer of the city of Ghent, and Anna van Exaarde.
The community had left its original home in Oosteeklo due to the burning of the monastery in 1577 (a result of the Dutch Revolt) and was living in a former residence of the Count of Flanders in Ghent.
[3] In this she was helped by donations from her father and from her sister, Margareta, who was prioress of the hospital in Kortrijk.
[4] Among her beautifications she commissioned a reliquary and a series of paintings of the mysteries of the rosary.