Antonio Grossich (7 June 1849 – 1 October 1926) was an Italian surgeon from Fiume (now Rijeka, Croatia), a politician, and a writer.
Born in Draguć (Draguccio d'Istria), halfway between Buzet (Pinguente) and Pazin (Pisino), Istria, Grossich at first studied law in Graz, but then shifted to medicine in Vienna, graduating in 1875.
There, he worked at the First Surgery Clinic of the University of Vienna with Karel Maydl.
He practised obstetrical medicine under the supervision of Eduard Albert, who from 1873 to 1881 was a professor of surgery in Innsbruck, where he introduced mandatory antiseptic treatment for wounds.
In 1924, he consigned the Key to the City to Italian King Victor Emmanuel III on the day of the official annexation of Fiume to Italy, where he later died.