Luigi Biraghi was a 19th-century Italian Catholic priest who lived and worked in Milan. Born in 1801, he dedicated his life to spiritual direction, teaching, and ecclesiastical scholarship. He is most notably remembered for founding the Sisters of Saint Marcellina, a religious congregation established to provide education to girls and support for the poor. Throughout his career, he held significant roles, including serving as a canon and a vice-prefect at the Biblioteca Ambrosiana.