Mirza Muhammad Hassan Qateel (1757/58-1818AD) is an eminent writer, critic, lexicologist and poet of Persian language and literature of sub-continent. He was born in Delhi in a Hindu family. In the age of 18, he embraced Islam with a name of Mirza Muhammad Hassan Qateel. After that, he lived in Lucknow. He wrote near 20 books on various topics of Persian language and literature like grammar, lexicography, history, prose, prosody and poetry. Apart from Persian language and literature, Mirza Qateel also had a good grasp on Turkish language and literature. He made great efforts in the promotion of Persian language as well as Turkish language in sub-continet and not only taught Turkish language to his students but also encouraged them to write and compile books in Turkish language. Qateel himself worked on Turkish language and literature in three contexts. He wrote letters in Turkish language to his friends and students, discussed the grammatical structure of Turkish language in his works like "Nahr ul Fasahat" and "Char Sharbat" and compiled stories in Turkish language. This article deals with the contribution of Mirza Muhammad Hassan Qateel towards Turkish language and literature.