Who Is a Jew? The Two Ways Jewish Identity Is Determined

"Who is a Jew?" sounds like it should be a simple question. But you would be amazed how many different answers people give. Is a Jew someone who observes Jewish law? Someone who lives in Israel? Someone who believes in a particular set of ideas? Someone who has Jewish ancestry?

The options and opinions are many, but according to Jewish law the answer is actually straightforward. There are exactly two ways to be a Jew.

Jewish Through Matrilineal Descent

If your mother is Jewish — through an unbroken chain of Jewish mothers going back through the generations — then you are Jewish. Period. It does not matter if you are observant or not. It does not matter if you have ever set foot in a synagogue. If your mother is Jewish, you are a Jew.

Here is what often surprises people: if your father is Jewish but your mother is not, you are not considered Jewish according to Orthodox Jewish law. And the reverse is also true — if your mother is Jewish and your father is not, you are fully Jewish.

This matrilineal principle is a core element of Jewish law and has been the standard for thousands of years.

Jewish Through Conversion

The only other way to become Jewish is through a proper conversion to Judaism, performed under the authority of an Orthodox beis din (court of Jewish law). Conversion is a serious process that involves study, commitment to observing the mitzvos (commandments), and immersion in a mikvah (ritual bath). For men, it also includes circumcision.

Once a person has completed a legitimate conversion, they are fully Jewish — as Jewish as someone born to a Jewish mother. And their children, born after the conversion through Jewish matrilineal descent from the mother, are Jewish as well.

Once Jewish, Always Jewish

Here is something that many people do not realize: according to Jewish law, a Jew cannot stop being Jewish. Even if a Jewish person converts to another religion, they are still considered Jewish — a Jewish person who has made a serious mistake, but Jewish nonetheless.

Even if someone's family has not practiced Judaism for many generations, as long as their matrilineal descent is Jewish, they need no conversion. They are a Jew just like any observant Orthodox Jew. The neshama (soul) of a Jew is eternal, and no decision or circumstance can erase that identity.

Why This Matters

Jewish identity is not a membership you sign up for and cancel when it no longer suits you. It is not about what you believe or how you practice. It is about who you are — at the deepest level of your soul.

I have met people who discovered late in life that their mother's mother was Jewish, and they were stunned to learn that according to Jewish law, they had been Jewish all along. That is the power of this principle. Being Jewish is not something you do. It is something you are.

So now you know the answer to "who is a Jew." It is simpler than most people think — and more profound than most people realize.