Shams-ud-Din Shah Mir (reigned 1339–42) is a ruler of Kashmir and the founder of the Shah Miri dynasty named after him.

Sams'd-Din, also Dhams-ud-din and Shah Mir, is of Turkic origin and the first Muslim ruler of Kashmir and founder of the Shah Mir Dynasty.

Jonaraja, in his Dvitīyā Rājataraṅginī mentioned him as Sahamera.

He came from Swat according to some sources.

However, Jonaraja, a credible historian, informs us that Shahmir was not from Swat.

Some historians agree that he was not from Swat but was a Kshatriya descended from Arjuna whose ancestors had taken up Islam.

Shah Mir arrives in Kashmir in 1313 along with his family, during the reign of Suhadeva (1301-1320), whose service he enters.

In subsequent years, through his tact and ability, Shah Mir rises to prominence and becomes one of the most important personalities of his time.

After the death in 1338 of Udayanadeva, the brother of Suhedeva, he is able to assume the kingship himself, founding his eponymous dynasty in 1339.