Asa Kasher (Hebrew: אסא כשר; born June 6, 1940) is an Israeli philosopher and linguist working as a Professor at Tel Aviv University.

He is noted for authorship of Israel Defense Forces's Code of Conduct,[2] as well as his co-authorship of an amended version of the controversial Hannibal Directive in the 1990s.

[3][4] Kasher has also written an influential defense of Israel's 'law of return', justifying it as a form of affirmative action, following periods in which Jews were not allowed to immigrate to many countries.

[7] His essays on Jewish subjects are collected in a book titled Ruach Ish (Spirit of a Man), published in Hebrew by Am Oved publication house.

[14] Kasher was also criticized in his role as Editor-in-Chief of the philosophy journal Philosophia, which published and later retracted an article by Kevin MacDonald, titled “The ‘Default Hypothesis’ Fails to Explain Jewish Influence”.