Mieczysław Surzynski (1866 - 1924) was a Polish composer and organist.
Surzynski came from a musical family, his father was an organist, as well as three of his brothers. He studied from 1885 to 1887 at the Berlin Conservatory organ with Otto Dienel and composition with Ludwig Bussler and Robert Radecki . He continued his studies in Leipzig with Paul Homeyer and Salomon Jadassohn and eventually studied in Regensburg church music.
In Poznan he was artistic director of the Musical Society and organist at the cathedral. In 1891 he became head of the church choir in Latvia Liepaja , from 1893 to 1900 he was choir director at the Cathedral of Saint Petersburg. From 1904 he was choirmaster at the cathedral and the seminary in Saratov and professor at the Imperial Music School.
After a year in Kiev in 1904 he moved to Warsaw. From 1906 to 1909 he was conductor of the Warsaw Philharmonic choir. From 1906 until his death he was professor of organ at the Academy of Music in Warsaw . He was also from 1909 organist at the Cathedral of St. John. As a composer he created mainly romantic organ works, the most famous are the improvisations on Święty Boże and his Organ Concerto, which was long considered lost.