Paul Milliet was a French playwright and librettist of the Parisian Belle Époque.

His opera librettos include Jules Massenet's Hérodiade (1881) and Werther (1892), Alfred Bruneau's Kérim (1887), Spyridon Samaras's La biondinetta (1903), Mademoiselle de Belle Isle (1905) and Rhea (1908) and Camille Erlanger's Forfaiture (1921). He was married to soprano Ada Adini.