"Badshahi Angti" (English title: "The Emperor's Ring") is a novel by Satyajit Ray featuring the private detective Feluda. It was first serialized in Sandesh magazine during the years 1966–67. Subsequently, it was released in book form in 1969 by Ananda Publishers. This novel marks the debut of the Feluda series created by Satyajit Ray.

The initial serialization of the novel took place in Sandesh magazine during the period of 1966-67. It was subsequently published as a book in 1969 by Ananda Publishers. This particular work marks the debut of Satyajit Ray's renowned character, Feluda. Despite his significant artistic contributions, Ray's identity as an illustrator and designer remains relatively lesser-known outside of Bengal, where his work has left a lasting impact. The novel "Badshahi Angti" was adapted into a film in 2014, featuring actor Abir Chatterjee portraying the character of Feluda for the first time.