The Law of Return is an Israeli law, passed on 5 July 1950, which gives Jews, people with one or more Jewish grandparent, and their spouses the right to relocate to Israel and acquire Israeli citizenship. Section 1 of the Law of Return declares that "every Jew has the right to come to this country as an oleh [immigrant]". In the Law of Return, the State of Israel gave effect to the Zionist movement's "credo" which called for the establishment of Israel as a Jewish state. In 1970, the right of entry and settlement was extended to people with at least one Jewish grandparent and a person who is married to a Jew, whether or not they are considered Jewish under Orthodox interpretations of Jewish law.

Aliyah is the immigration of Jews from the diaspora to, historically, the geographical Land of Israel or the Palestine region, which is today chiefly represented by the State of Israel. Traditionally described as "the act of going up", moving to the Land of Israel or "making aliyah" is one of the most basic tenets of Zionism. The opposite action — emigration by Jews from the Land of Israel — is referred to in the Hebrew language as yerida. The Law of Return that was passed by the Israeli parliament in 1950 gives all diaspora Jews, as well as their children and grandchildren, the right to relocate to Israel and acquire Israeli citizenship on the basis of connecting to their Jewish identity.