The Charles Street Jail (built 1851) or "Suffolk County Jail" is an infamous former jail  located in Boston, MA. It is listed in the state and national Registers of Historic Places. The Liberty Hotel, as it is now known, has retained much of the historic structure, including the famed rotunda.

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Over the years, the jail has housed a number of famous inmates including James Michael Curley, Malcolm X, Sacco and Vanzetti, suffragists imprisoned for protests when President Woodrow Wilson visited Boston in 1919, and World War II prisoners of war from the German submarines U-234 and U-873.

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The building is now owned by the Massachusetts General Hospital. It has since been redesigned by Cambridge Seven Associates and Ann Beha Architects, and reopened in the summer of 2007 as a 300-room luxury hotel with a number of high end bars and restaurants, operated by MTM Luxury Lodging.