Guillaume Gouffier, seigneur de Bonnivet was a French soldier.
The younger brother of Artus Gouffier, seigneur de Boisy, tutor of Francis I of France, Bonnivet was brought up with Francis, and after the young king's accession he became one of the most powerful of the royal favourites. On 31 December 1517 he was made Admiral of France, in charge of all maritime affairs from which he received substantial revenues, including portions of the gains from wrecks and prizes. In the imperial election of 1519 he superintended the candidature of Francis, and spent vast sums of money in his efforts to secure votes, but without success. An implacable enemy of the Constable de Bourbon, he contributed to the downfall of the latter. In command of the army of Navarre in 1521, he occupied Fuenterrabia and was probably responsible for the renewal of hostilities resulting from its not being restored.
Bonnivet succeeded Odet de Foix, Vicomte de Lautrec, in 1523, as commander of the army of Italy and entered the Milanese, but was defeated and forced to effect a disastrous retreat, in which the chevalier Bayard perished.