Fax is the greedy, violent self-styled "Lord of Seven Holds" in Anne McCaffrey's Dragonriders of Pern series. Originally a nephew of Lord Faroguy of High Reaches, he carefully conquered hold after hold by means of trickery, marriage, murder, and force. He repressed his holders, denied them education, and encouraged them to mistrust harpers and dragonriders. At the height of his power, he controlled High Reaches, Crom, Nabol, and Ruatha, as well as three minor holds. Fax married many women, including Lady Gemma of Crom. Fax's downfall was engineered by Lessa, the orphaned daughter of the Lord Holder of Ruatha, who hid for ten years as a kitchen drudge and mentally repressed Ruatha's natural productivity. On a visit to Ruatha Hold, Fax died in a brutal fight with the Bronze dragonrider F'lar, but not before he had named his infant son, Jaxom, as his successor.

Fax was the nephew of Lord Faroguy of High Reaches, and was known as being greedy and ruthless even in his youth.

• Fax features in Dragonflight and The Masterharper of Pern.