| Zainuddin | |
| Native Name: | জৈনুদ্দীন |
| Native Name Lang: | bn |
| Birth Date: | 15th-century |
| Birth Place: | Bengal Sultanate |
| Occupation: | Writer |
| Notable Works: | Rasul Bijay |
Zainuddin (Bengali: জৈনুদ্দীন or Bengali: জএনুদ্দিন) was a medieval Bengali poet of the 15th century. He was under the patronage of Prince Yusuf Khan, who would later become the Sultan of Bengal.[1]
Zainuddin was born into a Bengali Muslim family in the 15th century. His father, Moinuddin, claimed descent from Abu Bakr, a companion of Muhammad and the inaugural Rashidun Caliph. Zainuddin was a Sufi murid, and his pir was Shah Muhammad Khan.
Between 1472 and 1473, Zainuddin composed a fictional tale titled Rasul Bijay, the source of which is said to have been a novel in the Persian language. Its plot consisted of a war in which Jaikum, a fictional king of Iraq, was defeated by the Muslims who were led by Muhammad.[2] The book was sponsored by Yusuf Khan, the son of Sultan Rukunuddin Barbak Shah of the Ilyas Shahi dynasty.[3]