Ivan Dadić, DSc (born 1944) is a Croatian professor working on the Faculty of Transport and Traffic Engineering on the University of Zagreb. He is well known for his proposed changes to alleviate traffic congestion in Zagreb and better the transportation situation in Croatia.
Dadić was born in the village of Milešina near Muć, Dalmatia. He graduated at the University of Belgrade Faculty of Transport, obtained a master's degree at the University of Zagreb Faculty of Architecture, and obtained a doctorate at the aforementioned faculty in Belgrade. He is the author of more than 130 scientific publications and 160 traffic studies.