Antonio Straivari (1644 – December 18, 1737) was an Italian luthier, a crafter of stringed instruments such as violins, cellos, guitars and harps. Stradivari is generally considered the most significant artisan in this field. The Latinized form of his surname, Stradivarius, as well as the colloquial, "Strad", is often used to refer to his instruments.