Judas, My Brother: The Story of the Thirteenth Disciple is a 1968 historical novel by Frank Yerby, published by Dial Press.

Written from the viewpoint of Nathan ('the Thirteenth Disciple'), the heavily footnoted book presents an adventure and romance storyline against the backdrop of the 1st century Roman Empire.

Nathan's travels lead him to Rome to fight as a retiarius, and on his return to Palestine to become involved with the Apostles, the Zealots and the Essenes.

This story is simultaneously used as a vehicle for Yerby's examination of the historical personalities and Christian beliefs through the ideas of critical theological writings.

The sleeve notes continue: Though Yerby is skeptical of Biblical accounts of supernatural 'miracles', he presents the character 'Yeshua' as a man of strong moral character, deep compassion and keen insight into human nature, with a remarkable ability to inspire loyalty in his followers.