Jules François Marie Duplessis Kergomard, called Gustave de Penmarch (14 July 1822, Morlaix – 28 March 1901, Morlaix) was a 19th-century French poet and chansonnier.
The husband of Pauline Kergomard whom he married in 1863, he wrote under her pseudonym many poems often set in musique by Alfred Dufresne.
In 1875, he published the posthumous works of Gustave Penmarch who was none other than himself.