Guido Maggiorino Gatti (1892–1973) was an Italian musicologist, editor, administrator, and music critic.
He began his career as an editor while a student; working as the editor-in-chief of La Riforma musicale from 1913-1915.
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).