Onorio Marinari was an Italian painter and printmaker of the Baroque period, active mainly in Florence. His father, Sigismondo di Pietro Marinari, was also a painter, and he trained with his cousin, Carlo Dolci, later being also influenced by Simone Pignoni and Francesco Furini.

His fresco in the Palazzo Capponi, Florence, is dated 1707. In 1674 he published his illustrated Fabbrica ed uso dell' Annulo Astronomico. Bartolomeo Bimbi was one of his pupils.