Ser Joseth Mallister was a knight from House Mallister during the reign of King Daeron II Targaryen.
Joseth wore a winged helm. His shield bore a silver eagle flying across an indigo sky, the arms of House Mallister.
In 209 AC, Ser Joseth participated in the tourney at Ashford Meadow. He challenged Ser Humfrey Hardyng in the second tilt, but was defeated and carried from the field unconscious.