Taj al-Dawla Ziyar was the Baduspanid ruler ("ustandar") of Rustamdar from 1325 to 1333. He succeeded to the throne after instigating the murder of his predecessor and brother Nasir al-Din Shahriyar through his son Iskandar.
He defeated his brother Izz al-Dawla, who opposed him and had sought support from the Mongol Ilkhanate. He died in 1333 in Kavir, and was succeeded by his son Jalal al-Dawla Iskandar.
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