Hammamizade İsmail Dede Efendi (1778–1846) was a renowned Ottoman classical music composer. Notable for masterpieces like Ey büt-i nev edâ olmuşum müptelâ, he composed hundreds of songs and enriched musical modes like sultanî yegâh. Dede Efendi's influence extended to Hamparsum Limonciyan, creator of Hamparsum notation. His contributions to Mevlevi music and his museum in Kumkapi stand as legacies.