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| Zeno | 474 | 491 | Eastern Roman Empire | ||
| Zamasp | 496 | 498 | Sasanians | ||
| Yosada | 325 | 335 | Kidarites | ||
| Yazid ibn Mu'awiya ibn Abi Sufyan | 680 | 683 | Umayyads | ||
| Yazīd b. al-Walīd | 744 | 744 | Umayyads | ||
| Yazīd b. ʿAbd al-Malik | 720 | 724 | Umayyads | ||
| Yazdgerd III | 632 | 651 | Sasanians | ||
| Yazdgerd II | 438 | 457 | Sasanians | ||
| Yazdgerd I | 399 | 420 | Sasanians | ||
| Wittiza | 698 | 710 | Visigoths | ||
| Witteric | 603 | 609 | Visigoths | ||
| Witiges | 536 | 540 | Ostrogoths | ||
| Wazena | 539 | 575 | Aksumites | ||
| Wamba | 672 | 680 | Visigoths | ||
| Walīd b. Yazīd | 743 | 744 | Umayyads | ||
| Walaxs I | 484 | 488 | Sasanians | ||
| Waiofar of Aquitaine | 744 | 768 | Merovingians | ||
| Wahram V | 420 | 438 | Sasanians | ||
| Wahram IV | 388 | 399 | Sasanians | ||
| Wahram III | 293 | 293 | Sasanians |