| Royal Bengal Rahasya (The Royal Bengal Mystery) | |
| Author: | Satyajit Ray |
| Country: | India |
| Language: | Bengali |
| Cover Artist: | Satyajit Ray |
| Genre: | Detective fiction |
| Publisher: | Ananda Publishers |
| Release Date: | 1974 |
| Media Type: | |
| Preceded By: | Kailashey Kelenkari |
| Followed By: | Joi Baba Felunath |
Royal Bengal Rahashya is a novel in Feluda Series created by the eminent author and director Satyajit Ray. It is of 88 pages and is published by Ananda Publishers Pvt. Ltd. in 1975. It was preceded by Kailashey Kelenkari and followed by Joi Baba Felunath.
On an invitation by Mahitosh Singha Ray, Lalmohon Babu takes Feluda and Topshe to a forest near Bhutan where Feluda is given a puzzle to solve. He solves that successfully, unearths hidden secrets of the Sinha Ray family, solves a murder and kills a man-eating tiger in the process. At the end of the story, he is rewarded with the Tiger-skin. This story tells about Feluda 's impressive reflex skills and his spear sharp mind with its unbeatable craze for mysteries.