Al-Hasan Badr al-Din ibn Idris was the 20th of Tayyibi Isma'ilis in Yemen from 1468 to 1512.
He succeeded his father Idris Imad al-Din in 1468, and held the post until his death in 1512, when he was succeeded by his brother al-Husayn Husam al-Din. Al-Hasan encouraged education and bestowed great favors on his students. He used to shower special attention on anyone who came from India.
His son, Muhammad Izz al-Din I, would succeed as the 23rd in 1527, the last from the Banu al-Walid al-Anf family that had dominated the office since the early 13th century.