The Mausoleum of Shah Abbas I (; ), also known as Imamzadeh Habib ibn Mussa, is a Shi'ite mausoleum and imamzadeh complex, located in Kashan, Isfahan province, Iran. The structure is the resting place of Abbas the Great, the fifth shah of Safavid Iran.
The mausoleum was added to the Iran National Heritage List on 7 December 1935 and is administered by the Cultural Heritage, Handicrafts and Tourism Organization of Iran.
According to the dates on the mihrab of the tomb, the primary structure was built before the 12th century. The structure was expanded during the Safavid era. The southwestern portico features a rectangular stone which originates in the Caucasus.