Ali Shams al-Din (Arabic: علي شمس الدين) (Arabic: ʿAlī Shams al-Dīn ibn ʿAbdallāh ibn al-Walīd) was the 18th Tayyibi Isma'ili Dāʿī al-Muṭlaq in Yemen. He succeeded his brother al-Hasan Badr al-Din I in 1418, and held the post until his death in 1428, when he was succeeded by his nephew (al-Hasan's son) Idris Imad al-Din.