Giovanni Battista Guadagnini, Italian instrument maker (d. 1786)
Giovanni Battista Guadagnini (often shortened to G. B. Guadagnini; 23 June 1711 – 18 September 1786) was an Italian luthier, regarded as one of the finest craftsmen of string instruments in history. He is widely considered the third greatest maker after Antonio Stradivari and Giuseppe Guarneri "del Gesù". The Guadagnini family was known for their violins, guitars and mandolins.