Michał Dymitr Tadeusz Krajewski (8 September 1746 – 5 July 1817), sometimes also referred to as Dymitr M. Krajewski, was a Polish writer and educational activist of the times of the Enlightenment in Poland. His 1784 book Podolanka became the most debated and published Polish novel of that year, and his next book, Wojciech Zdarzyński, is considered to be the first Polish science-fiction novel.
Krajewski (coat of arms Jasieńczyk) was born in the Rus Voivodeship on 8 September 1746. On 22 July 1763 he joined the order of Piarists in Podoliniec, where he gained the name of Dymitr. After his novitiate he studied rhetoric and philosophy in Międzyrzecze Koreckie. From 1769 he attended the Piarists college in Warsaw and in 1782 he became a prefect of Collegium Nobilium. Author of several books and other literary works, he was supported by the Church itself. In 1788 he took the rectory in Białaczów. In 1793 he left the priesthood and settled in Końskie. In 1809 he moved to Warsaw, where he joined the Society of Friends of Science (Towarzystwo Przyjaciół Nauk).
Krajewski's writings concentrated on social issues and political debate about the need to reform the Polish-Lithuanian Commonwealth (along the lines suggested by Jean-Jacques Rousseau). He was the supporter of the reformists idea, especially in the area of the education (like the reforms of the Commission of National Education, first ministry of education in the world).