Betzy Holmberg Deis (1860–1900) was a Finnish-Norwegian composer who built a notable career in late 19th-century Central Europe. Born in Düsseldorf to Finnish painter Werner Holmberg and Norwegian artist Anna Holmberg, she grew up in Christiania (now Oslo) and received a cosmopolitan education in Copenhagen and Leipzig. In Leipzig, she studied with Salomon Jadassohn and Carl Reinecke at the Royal Conservatory, where several of her chamber and orchestral works were performed and well received.
A dedicated symphonist and chamber music composer, Holmberg Deis completed her Symphony No. 1 in 1884, with movements performed in Germany, Denmark, and Finland. Her works were praised for their technical skill, dramatic character, and neo-romantic expressiveness, drawing comparisons to Grieg and Schumann. Her chamber pieces—particularly the Suite for Violin and Piano, Two Pieces for Piano, and Andante for Piano and Violin—are among the few surviving compositions from a catalogue that once included orchestral suites, a symphony, and lieder.
Despite early acclaim, her public career ended abruptly in the early 1890s, likely due to a brief and troubled marriage. She died in Hamburg at the age of 40. While much of her music and documentation has been lost, recent scholarship has begun restoring her legacy as one of the overlooked voices of Nordic Romanticism.