Jan Kleczyński (1859–1929) was a Polish composer and pianist known primarily for his contributions to classical music, particularly in the late Romantic and early 20th-century styles. He studied at the Warsaw Conservatory and later in Berlin, where he was influenced by prominent composers of the time. Kleczyński's notable works include piano compositions, chamber music, and orchestral pieces. His "Fantaisie for Piano and Orchestra" and various piano sonatas reflect his intricate melodic style and harmonic richness. He is also recognized for his piano transcriptions of works by other composers, which helped popularize their music in Poland. While not as widely known as some of his contemporaries, Kleczyński played a significant role in the Polish music scene, contributing to the national identity through his compositions. His music is characterized by a blend of lyrical melodies and technical prowess, influencing future generations of Polish composers. His impact, though subtle, is evident in the way he helped bridge the gap between Polish folk influences and European classical traditions. Kleczyński's works continue to be performed, showcasing the enduring legacy of his artistry.