200px|right|thumb|Coat of Arms of the Massalski familyThe House of Massalski (Plural: Massalscy, feminine form: Massalska), sometimes Masalski, Massalsky or Mosalsky, is a Polish-Lithuanian, Russian-Lithuanian princely family of Ruthenian origin from the Principality of Chernigov and based on the city of Mosalsk.
The family descended from the Rurik dynasty. Their princely title was recognized in 1775. Living family members are members in the Confederation of the Polish Nobility.