Menahem E. Yaari (Hebrew: מנחם יערי; born April 26, 1935) is an Israeli economist who has been the S.A. Schonbrunn Professor of Mathematical Economics at The Hebrew University of Jerusalem and was the President of the Open University of Israel from 1992 to 1997.

[1][2] From 1967 to 1970 he was a Senior Lecturer and Associate Professor of Economics and Philosophy of Science at the Hebrew University of Jerusalem.

[1] Since 1969 he has been a Fellow of the Econometric Society, since 1988 Yaari has been a foreign Member of the American Academy of Arts and Sciences, since 1991 he has been a Member of the Israel Academy of Sciences and Humanities, since 1993 he has been a foreign honorary member of the American Economic Association, since 1996 he has been a Fellow of the Berlin-Brandenburg Academy of Sciences.

[5][1] He has been the founding Member of The International Scientific Council of IPSO (Israeli-Palestinian Science Organization) since 2003, the President of the Israel Academy of Sciences and Humanities from 2004 to 2010, and a Member of the American Philosophical Society since 2008.

[14] Thereafter, he was the President of the Open University of Israel from 1992 to 1997, following Nehemia Levtzion, and was succeeded by Eliahu Nissim.