Charles "King" Solomon (1884 – January 24, 1933) was a Russian-born mob boss who controlled Boston's bootlegging, narcotics, and illegal gambling during the Prohibition era.
One of the earliest organized crime figures in New England's history, Solomon immigrated from the Russian Empire as a boy settling with his family in Boston's West End.
By the early 1920s, he controlled the majority of illegal gambling and narcotics, such as cocaine and morphine, before expanding into bootlegging during Prohibition, owning many of the cities' most prominent speakeasies, including the Cocoanut Grove nightclub.
Attending the Atlantic City Conference in 1929, Solomon was one of the several leaders in the "Big Seven" who helped negotiate territorial disputes and establish policies which would influence the later National Crime Syndicate in 1932.
Solomon continued to control illegal gambling in New England until his death on January 24, 1933, when he was murdered in the men's room of Boston's Cotton Club by rival gunmen John Burke and James Coyne.