Guido Pannain (17 November 1891 – 6 September 1977) was an Italian musicologist, critic and classical composer.

[1][2] Between 1915 and 1947, he served as professor at the Naples Conservatory, and between 1952 and 1955 he was professor of music history at the Accademia Nazionale di Arte Drammatica Silvio D'Amico.

[1] Pannain was author of numerous studies and essays, often focusing on the history of the Neapolitan music; among his most important works, Modern composers (in Italian Musicisti dei tempi nuovi, 1932), a collection of profiles of the leading contemporary composers, La vita del linguaggio musicale: saggio di estetica ("The Life of Musical Language: An Essay on Aesthetics", 1947), an essay in which he applied the Benedetto Croce's neo-idealistic theories over music, and Storia della musica (1936-1964), a history of the music he co-wrote with Andrea Della Corte.

[1][2] Also a composer, Pennain was awarded at the 1928 International Columbia Graphophone Competition for his Sinfonietta.

His works include numerous concertos, a symphonic poem, and several operas, the most successful of them being a Madame Bovary he co-wrote with Vittorio Viviani in 1955.