Guido Agosti (11 August 1901 – 2 June 1989) was an Italian pianist and piano teacher. Agosti was born in Forlì in 1901. He studied piano with Ferruccio Busoni, and , earning his diploma at age 13. He studied counterpoint under Benvenuti and literature at Bologna University. He commenced his professional career as a pianist in 1921. Although he never entirely abandoned concert-giving, nerves made it difficult for him to appear on stage, and he concentrated on teaching. He taught piano at the Venice Conservatoire and at the Santa Cecilia Academy in Rome. In 1947 he was appointed Professor of piano at the Accademia Chigiana (Siena). He also taught at Weimar and the Sibelius Academy in Helsinki.