Marco Enrico Bossi (25 April 1861 – 20 February 1925) was a prominent Italian organist, composer, improviser, and teacher, known for his contributions to the Romantic era of music. Born in Salò, Italy, into a family of musicians, Bossi received his musical education at the Liceo Musicale in Bologna and the Milan Conservatory. His instructors included notable figures such as Amintore Galli, Francesco Sangalli, Amilcare Ponchielli, and Polibio Fumagalli.

Bossi's career was marked by significant appointments, including director of music and organist at Como Cathedral in 1881, and later as a professor at the Naples Conservatory. He also held directorships at conservatories in Venice, Bologna, and Rome, where he established enduring standards for organ studies in Italy. His influence extended through his students, including Giulio Bas and Gian Francesco Malipiero, among others.

Throughout his life, Bossi was an active performer, engaging in numerous international organ recital tours that connected him with esteemed contemporaries such as César Franck and Camille Saint-Saëns. His compositional output exceeded 150 works, with a notable focus on organ music, which remains a significant part of his legacy.

In 1924, Bossi embarked on a recital tour in the United States, performing at prestigious venues such as Wanamaker's department store in Philadelphia. Unfortunately, he fell ill during this tour and passed away unexpectedly at sea while returning to Italy. Bossi was interred in Como, Italy. His contributions to music, particularly in the field of organ composition and education, continue to be recognized and celebrated.