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Syedna Yusuf Najmuddin Bin Syedna Zakiuddin  (Arabic: يوسف نجم الدين) (died: 18 Jumadil Akhir 1213 AH/27 November 1798 AD, Surat, India) was the 42nd Da'i al-Mutlaq (Absolute Missionary) of the Dawoodi Bohra sect of Musta‘lī Islam. He succeeded the 41st Dai Syedna Abduttayyeb Zakiuddin Bin Syedna Badruddin, to the religious post.
- List of Syednas (according to Dawoodi Bohras)
- (A Chronological List of Duatil Mutlaqin)
- Daftary, Farhad, The Ismaili, Their History and Doctrine(Chapter -Mustalian Ismailism-p. 300-310)*Daftary, Farhad, The Ismaili, Their History and Doctrine(Chapter -Mustalian Ismailism-p. 300-310)
- Lathan, Young, Religion, Learning and Science
- Bacharach, Joseph W. Meri, Medieval Islamic Civilisation