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| Yazdgerd II | 438 | 457 | Sasanians | ||
| Yazdgerd III | 632 | 651 | Sasanians | ||
| Yazīd b. ʿAbd al-Malik | 720 | 724 | Umayyads | ||
| Yazīd b. al-Walīd | 744 | 744 | Umayyads | ||
| Yazid ibn Mu'awiya ibn Abi Sufyan | 680 | 683 | Umayyads | ||
| Yosada | 325 | 335 | Kidarites | ||
| Zamasp | 496 | 498 | Sasanians | ||
| Zeno | 474 | 491 | Eastern Roman Empire |