Guido Maggiorino Gatti (1892–1973) was an Italian musicologist, editor, administrator, and music critic.
He wrote the opera libretti for Giorgio Federico Ghedini's Gringoire (1915, unperformed) and Vincenzo Davico's La dogaressa (1919, Opéra de Monte-Carlo).
These articles were known collectively as Musicisti stranieri (later re-named Musicisti contemporanei) with publications on Franco Alfano, Georges Bizet, Ernest Bloch, Alfredo Casella, Mario Castelnuovo-Tedesco, Claude Debussy, Eugene Goossens, Gabriel Grovlez, John Ireland, Gian Francesco Malipiero, Luigi Perrachio, and Ildebrando Pizzetti.
[1] He was also editor of the journal Rivista musicale italiana which sponsored the first Congresso Italiano di Musica; holding that event in Turin in 1921.
With the musicologist Andrea Della Corte he co-authored the music reference work Dizionario di musica (1930, Turin).
In 1933 he served as secretary-general of the Maggio Musicale Fiorentino's first festival, and was secreatry-general of first International Congress of Music (ICM) which was held in Florence.