Matthieu Coignet (c. 1514–1586) was a French lawyer, ambassador, landowner, and author.
Thanks to an early English translation, some English-language sources give his name as Martyn Cognet.
He was also Master of Requests to the French Queen, Catherine de' Medici, and in 1559 was appointed as procurator general of the Parlement of Savoy.
On 22 February 1580 he was noted as a member of the Conseil du Roi, a sometime ambassador to Schwyz and the Grisons, Master of Requests, and lord (seigneur) of La Tuillerie-les-Dampmartin and of part of Bregi-en-Mulcian.
[1] His work was translated into English by Edward Hoby and published in 1586 under the title Politique discourses on trueth and lying, with an introduction by Thomas Digges.