Sonar Kella (Bengali: সোনার কেল্লা), also Shonar Kella, is a 1971 mystery novel written by Bengali writer and filmmaker Satyajit Ray. In 1974, Ray directed a film adaption of the book, also named Sonar Kella, starring Soumitra Chatterjee, Santosh Dutta, Siddartha Chatterjee and Kushal Chakraborty. The movie was released in the United States as The Golden Fortress. It is the first film adaptation of Ray's famous sleuth Feluda and was followed by Joi Baba Felunath.