Mariam Dadiani may refer to:
- Queens of Kartli
- Mariam (Tamar) Dadiani (died c. 1614), daughter of George III Dadiani, Prince of Samegrelo and wife of George X of Kartli
- Mariam Dadiani (1599/1609–1682), daughter of Manuchar I Dadiani, Prince of Samegrelo and wife of Simon I Gurieli, Prince of Guria, in 1621, King Rostom of Kartli in 1638, and the latter's adopted son and successor, King Vakhtang V of Kartli in 165
- Queens of Imereti