François Falcʼhun (20 April 1901 – 13 January 1991) was a French linguist known for his theories about the origin of the Breton language.

Falcʼhun's early work included an edition of the writings of Jean-Marie Perrot.

His spelling, which does not use "zh", also abandons the Breton "cʼh" convention, introduced in the seventeenth century, and which is even used in the official French form of Falcʼhun's own name.

[1] Criticising the views of Joseph Loth and Léon Fleuriot, Falcʼhun claimed that the Vannetais dialect of eastern Breton was almost wholly Gaulish.

[2] Falcʼhun's views became controversial after the publication of his 1981 book, Perspectives nouvelles sur l’histoire de la langue bretonne (New Perspectives on the History of the Breton Language), in which his theories were linked to nationalist ideology.