Ivan Addae Mensah is a Ghanaian chemist and university administrator who served as the Vice-Chancellor of the University of Ghana, Legon from 1996 to 2002. He is an Emeritus Professor of Chemistry at the same institution. He is a Life Fellow of the Royal Society of Chemistry, Fellow of the Ghana Academy of Arts and Sciences and a Fellow of the Ghana Chemical Society.
ddae-Mensah is a member of the Fante ethnic group. He was educated at Achimota School and studied Chemistry at the University of Ghana, Legon, receiving his bachelor's degree with first class honours. He also obtained a Master of Science (M. Sc.) degree in Chemistry from the same university. Between 1967 and 1970, he pursued his PhD at Churchill College, University of Cambridge.