Kasher (hebrew: כשר) is a Hebrew surname meaning "fit" and in the common context, fit for consumption by Jews according to traditional Jewish law.

It may refer to: Tim Kasher – an American musician Aryeh Kasher – an Israeli history emeritus professor Asa Kasher – an Israeli philosopher and linguist Menachem Mendel Kasher – a Polish-born rabbi Moshe Kasher – American comedian and actor Joe Kasher – English footballer