Duke of Touraine was a title in the Peerage of France, relating to Touraine.
Arms of Philippe, Duke of Touraine, later Philip II, Duke of Burgundy. Nowadays, they are arms of Touraine and Indre-et-Loire
It was first created in 1360 for Philip, youngest son of King John II of France. He returned the duchy to the Crown in 1363 on being made Duke of Burgundy and died in 1404.
The next creation was in 1386 for Louis, youngest son of King Charles V of France. He returned the duchy to the Crown in 1392 on being made Duke of Orléans and died in 1407.
The third creation was in 1401 for John, fourth son of King Charles VI of France. He became Dauphin of France in 1415 and died unmarried in 1417.
The next creation was in 1416 for Charles, youngest son of King Charles VI of France, who succeeded his brother as Dauphin in 1417. He succeeded as King Charles VII of France in 1422 when the title merged in the Crown.
The fifth creation was in 1423 for the Scottish nobleman Archibald Douglas, 4th Earl of Douglas, a commander on the French side in the Hundred Years' War. He was killed at the Battle of Verneuil in 1424. His son Lord Wigtown, absent in Scotland, was believed in France to have died without issue, so the title was presumed extinct. When it became apparent that Wigtown had succeeded his father as Earl of Douglas, he was confirmed in the title Duke of Touraine, though not the lands. He died in 1439 and the male line of the fourth Earl of Douglas became extinct on the death of William Douglas, 6th Earl of Douglas the following year.
The land of Touraine was given, by letters-patent in Bourges on 21 October 1424, to Louis III of Anjou, "King of Sicily" (King of Naples). 
In 1528, the land of Touraine was given by Francis I of France to his mother Louise of Savoy as an exchange with the Duchy of Nemours, given to her in 1523.  
The next creation was in 1576 for Francis, youngest son of King Henry II of France, who was created Duke of Anjou and Berry at the same time. He died unmarried in 1584, when the title became extinct.
Modern courtesy title 
The title of "Duke of Touraine" was awarded in 1981 by the legitimist pretender, Alphonse of Bourbon, Duke of Cadiz and "Duke of Anjou", to his second son Louis Alphonse. Following his brother's death in 1984 and his father's one in 1989, he respectively became, under the same pretention, "Duke of Bourbon" and "Duke of Anjou". He is the current legitimist pretender to the title of King of France as "Louis XX".
As pretender, he didn't reaward the title so far, awarding his twin sons "Dauphin of France, Duke of Burgundy" and "Duke of Berry" respectively.
- ^ a b Pères Anselme & Ange, Histoire de la Maison Royale de France & des grands officiers, 1728, Tome III, p. 229-232 (Duchy of Touraine).
- ^ Pères Anselme & Ange, Histoire de la Maison Royale de France & des grands officiers, 1728, Tome III, p. 247 (Duchy of Nemours)