Joan II, Countess of Dreux

Joan II of Dreux (1309–1355) was the daughter of John II, Count of Dreux, and Péronnelle de Sully. In 1330 she married Louis I, Viscount of Thouars. When her half-brother Peter, the last male heir, died in 1345, Joan inherited the county and ruled it as countess until her death.

Her son Simon de Thouars succeeded her as count but died in 1365. The county then passed to her three daughters, Péronnelle, Isabeau and Marguerite.