Viserys Targaryen can refer to:
- King Viserys I Targaryen, the fifth king of the Targaryen dynasty. He was the grandson (and direct successor) of King Jaehaerys I Targaryen, who was himself the grandson of King Aegon the Conqueror. Father of Rhaenyra, Aegon II, Helaena, and Aemond. Brother of Rhaenys and Daemon Targaryen, who also became his son-in-law when he married Rhaenyra.
- King Viserys II Targaryen, the tenth king of the Targaryen dynasty. He was the youngest son of Rhaenyra Targaryen, grandson of King Viserys I, younger brother of King Aegon III, father of King Aegon IV, and uncle of Kings Daeron I and Baelor the Blessed. Since both his nephews died without issue, all subsequent Targaryen kings were descended from him.
- Prince Viserys Targaryen, son of King Aerys II Targaryen (commonly known as the Mad King), who as his father's successor in exile styled himself as "King Viserys III" in opposition to the usurper King Robert Baratheon. Younger brother of Rhaegar Targaryen and older brother of Daenerys Targaryen.