Giustino Lorenzo Ferri (23 March 1856, in Picinisco – 13 May 1913, in Rome) was an Italian journalist and writer.
He moved to Rome in 1880, to work as a contributor for the journal Capitan Fracassa, founded by Luigi Arnaldo Vassallo, Federico Napoli, Gennaro Minervini, and Giuseppe Turco.
From 1887 to 1899, he wrote for the journal Don Chisciotte della Mancia and Il Caffaro of Genoa.
He was a theater critic from 1889 on for the La Rivista d'Italia, Il Tirso, and finally Nuova Antologia.
He often wrote under pseudonyms such as Leandro Marquis of Carabas, Furio Stiniger, Maffio Scavelli, Fulvio Ginestri and Plongiak.