Presumed lost until now, Giulio Carpioni's painting depicting "The Flaying of Marsias" from Francesco Algarotti's collection has recently reappeared. The work is here published and discussed in the context of Count Algarotti's preferences. Algarotti owned seven paintings and twenty-nine drawings by Carpioni: after Giambattista Tiepolo, he was the best represented artist in the Count's collection.