"O Mon Romzaner Oi Rozar Sheshe" is a popular Bengali Eid-ul-Fitr song, written by Kazi Nazrul Islam, the national poet of Bangladesh. The song was written and composed in 1931 at the request of Nazrul's disciple, Abbasuddin Ahmed. The song is written on the end of the period of fasting and the Bengali celebration of Eid-ul-Fitr. The song remains one of the most popular Bengali song of all time and is a common tune heard in Bangladeshi households. This was regarded by his contemporaries as a significant achievement, as Bengali Muslims had been strongly averse to devotional music.