Mufakkir al-Islām Ḍiyā' ad-Dīn ibn Muqaddas ʿAlī (Arabic: مفكر الإسلام ضياء الدين بن مقدس علي; born 4 April 1941), better known simply as Zia Uddin (Bengali: জিয়া উদ্দিন) or reverentially as Nazim Saheb Huzur (Bengali: নাজিম সাহেব হুজুর), is a Bangladeshi Deobandi Islamic scholar, politician and educationist.

Uddin is also the director of Jamia Madania Angura-Muhammadpur and a member of Al-Haiatul Ulya Lil-Jamiatil Qawmia Bangladesh's permanent committee.

He has played important roles in the 2013 Shapla Square protests and Khatme Nabuwwat movement, and has spoken out against the construction of the Tipaimukh Dam.

Zia Uddin was born on 4 April 1941 to a Bengali Muslim family in the village of Kakardia in Beanibazar, Sylhet District.

He then proceeded to study at Gachbari Jamiul Uloom Madrasa until 1962, before enrolling at Al-Jamiatul Ahlia Darul Ulum Moinul Islam in Hathazari.

Zia Uddin is advisor to several social, literary and cultural organisations like Ash-Shihab Parishad, IQRA Foundation UK, Al-Hilal Student's Union, Al-Qalam Research Council, Chetana Literary Society, Jagoron Islamic Cultural Society and Hizb-e-Elahi Beanibazar.

[1][6][7] During his studies at Darul Uloom Hathazari in 1961, Zia Uddin was shot as a result of taking part in a movement against Ayub Khan's "Muslim Family Laws" bill.

In 2013, Shahjalal University of Science and Technology decided not to construct any statues as a result of the Shah Jalal Heritage Preservation Committee led by Zia Uddin.

[1] He served as the Acting President of the Azad Dini Adarah-e-Talim's International Turban Tying Conference from 9 to 11 February 2012.