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 and Aegon II.
- King Viserys II Targaryen, youngest son of Rhaenyra Targaryen, and grandson of King Viserys I. Viserys II was the younger brother of King Aegon III.
- 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.