Modjtaba Sadria (Persian: مجتبی صدریا; born March 1949) is an Iranian-born philosopher, socio-cultural theorist and international social policy development specialist.

He has published many books and articles, including: "Global Civil Society and Ethics: Finding Common Ground" (Tokyo, 2003), "People Who Live on the Edge of the World" (Tokyo, 2002), "Realism: Trap of International Relations" (1994, in Japanese), and "Prayer for Lost Objects: A Non-Weberian Approach to the Birth of Modern Society" (2003, in Persian).

Sadria has been Professor of Monash University Faculty of Medicine, Nursing and Health Sciences in Melbourne, Australia since September 2009.

Notably, he has been the Master Jury in 2004 and Steering Committee in 2007 and 2010 for Aga Khan Award for Architecture, and Senior Associate of Global Reconciliation Network and Director of the Australian Centre for West and Central Asian Studies.

Furthermore, his vigorous activities can be seen in various other socio-intellectual movements such as Changing Teheran, and Global Cities Research Institute.