Ibrahim ibn al-Husayn ibn Abi'l-Su'ud al-Hamidi () was the second Tayyibi Isma'ili DÃÂÿë al-Muá¹Âlaq in Yemen from 1151 to his death in 1162.
Ibrahim was a member of the Hamidi branch of the Banu Hamdan. According to the 12th-century Yemeni historian Umara al-Yamani, he was chosen as chief dÃÂÿë by Queen Arwa al-Sulayhi already in 1132, but he was then replaced by the ruler of Aden, Saba ibn Abi'l-Su'ud ibn Zuray, possibly because Ibrahim espoused the Tayyibi sect in the schism with the Hafizis. Tayyibi sources mention none of this, however.
In 1138 he was chosen as chief assistant (maþdhà «n) by the first Tayyibi DÃÂÿë al-Muá¹Âlaq, Dhu'ayb ibn Musa, and succeeded him upon his death in 1151, becoming thus the head of the Tayyibi community. He resided in Sana'a, under the protection of the city's ruler Hatim ibn Ahmad, who, although espousing the Hafizi sect, did not interfere with the Tayyibi missionary work. He chose Ali ibn al-Husayn ibn al-Walid (died 1159) and then his own son Hatim as maþdhà «n and designated successor. On his death in July 1162, Hatim succeeded him; his descendants monopolized the office of DÃÂÿë al-Muá¹Âlaq until 1209.
As leader of the Tayyibi community, he introduced the RasÃÂÿil IkhwÃÂn al-SafÃÂþ into Tayyibi literature, and in his own works incorporated many of the teachings of Hamid al-Din al-Kirmani. The resulting synthesis combined al-Kirmani's cosmology with mythical elements, and formed the foundation of the peculiar Tayyibi system of esoteric exegesis (haqÃÂ'iq). His major work was the KitÃÂb kanz al-walad ("Book of the ChildâÂÂs Treasure"), which provided the basis for many future Tayyibi haqÃÂ'iq authors.
The burial site of Ibrahim was unknown for a long time. His grave located in Ghail Bani Hamid at the outskirt of Sana'a, Yemen was successfully identified by Mohammed Burhanuddin on his visit to Yemen in 1961. His mausoleum was built in the year 2007.