Karim Shah (Bengali: করীম শাহ), also known as Karam Shah (Bengali: করম শাহ), was the founder of the mystic Pagal Panthi order in eastern Bengal (present-day Bangladesh).

Karim Shah resided in the village of Letarkanda in Pargana Sushang (presently under Durgapur Upazila, Netrokona).

His teachings attracted Sufis, Hindus and animists alike, and the members of his cult came to be known by commoners as Pagals (madmen).

Though the cult was non-violent, its members claimed that Karim Shah possessed spiritual prowess such as the ability to cure diseases, foretelling and bringing success to those he wished.

He married Chandi Bibi, and had a son known as Tipu Shah, who succeeded Karim as the movement's leader after his death in 1813.