Mazahir Uloom (جامعہ مظاہر علوم، سہارنپور‎) is an Islamic seminary located in Saharanpur, Uttar Pradesh. Started in November 1866 by Sa'ādat Ali Faqīh, and developed further by Mazhar Nanautawi and Ahmad Ali Saharanpuri; it is regarded as the second most influential and major Deobandi seminary in India. The earliest graduates of the seminary include famous Hadīth scholar Khalil Ahmad Saharanpuri.

The seminary split in 1983 into Mazahir Uloom Jadeed and Mazahir Uloom Waqf Qadeem. The incumbent rectors are Muhammad Aaqil Saharanpuri and Muḥammad Saeedi respectively.

Mazāhir Uloom was established as "Mazhar Uloom";on 9 November 1866, six months after the foundation of the Deoband seminary.Its founding figures include Ahmad Ali Saharanpuri, Mazhar Nanautawi, Qādhi Fazlur Rahmān and Sa’adat Ali Faqih.[5] Mazahir Uloom is thought to be the second major madrasa after Darul Uloom Deoband.

The first generation teachers, apart from the founders; include, Aḥmad Hasan Kanpuri, Sa'adat Hussain Bihari, Sakhāwat Ali Ambethwi and Muḥammad Siddīq.The first generation students include Khalil Ahmad Saharanpuri, Mushtāq Aḥmad Anbethwi and Qamruddīn Sahāranpuri.

In Muharram 1338 AH; the seminary established its Darul Ifta (the fatwa institute).The seminary's jurists include Ashfāqur Rahmān Kāndhlawi, Mahmood Hasan Gangohi, Abdul Qayyūm Raipuri and Muḥammad Shuaib Bastawi.