Hatchand Bhaonani Gurumukh Charles Sobhraj (born April 6, 1944), better known as Charles Sobhraj, is a French (France) serial killer of Indian and Vietnamese origin, who preyed on Western tourists throughout Southeast Asia during the 1970s. Nicknamed "the Serpent" and "the Bikini killer" for his skill at deception and evasion, he allegedly committed at least 12 murders. He was convicted and jailed in India from 1976 to 1997, but managed to live a life of leisure even in prison. After his release, he retired as a celebrity in Paris; he unexpectedly returned to Nepal, where he was arrested, tried and sentenced to life imprisonment on August 12, 2004.

While Sobhraj is widely believed to be a psychopath—he has a manipulative personality and is incapable of remorse—his motives for killing differed from those of most serial killers. Sobhraj was not driven to murder by deep-seated, violent impulses, but as a means to sustain his lifestyle of adventure. That, as well as his cunning and cultured personality, made him a celebrity long before his release from prison. Sobhraj enjoyed the attention, charging large amounts of money for interviews and film rights; he has been the subject of four books and three documentaries (documentary film). His search for attention and his overconfidence in his own intelligence are believed responsible for his return to a country where authorities were still eager to arrest him.