The brit milah (Hebrew: בְּרִית מִילָה‎, Modern Israeli: [bʁit miˈla], Ashkenazi: [bʁis ˈmilə]; "covenant of circumcision"), or bris (Yiddish: ברית‎, Yiddish: [bʁɪs]), is the ceremony of circumcision in Judaism and Samaritanism during which a newborn male's foreskin is surgically removed. According to the Book of Genesis, God commanded the biblical patriarch Abraham to be circumcised: an act to be followed by his descendants on the eighth day of life symbolizing the covenant between God and the Jewish people. Today, it is generally performed by a mohel on the eighth day after the infant's birth and is followed by a celebratory meal known as a seudat mitzvah.

Brit milah is considered among the most important and central commandments in Judaism, and the rite has played a central role in Jewish history and civilization. The Talmud, when discussing the importance of brit milah, considers it equal to all other mitzvot (commandments). Abraham's descendants who voluntarily fail to undergo brit milah, barring extraordinary circumstances, are believed to suffer Kareth, which, in Jewish theology, the extinction of the soul and denial of a share in the World to Come. The brit is understood by Jews to signify acceptance into the ongoing covenant between God and the Jewish people, which is why gerim undergo a form of brit to finalize conversion.

Historical conflicts between Jews and European civilizations have occurred several times over brit milah, including multiple campaigns of Jewish ethnic, cultural, and religious persecution, with subsequent bans and restrictions on the practice as an attempted means of forceful assimilation, conversion, and ethnocide, most famously in the Maccabean Revolt by the Seleucid Empire. "In Jewish history, the banning of circumcision (brit milah) has historically been a first step toward more extreme and violent forms of persecution". These periods have generally been linked to suppression of Jewish religious, ethnic, and cultural identity and subsequent "punishment at the hands of government authorities for engaging in circumcision". The Maccabee victory in the Maccabean Revolt—ending the prohibition against circumcision—is celebrated in Hanukkah. Circumcision rates are near-universal among Jews.

Brit milah also has immense importance in other religions. The Gospel of Luke records that Mary and Joseph, the parents of Jesus, had him undergo circumcision.

The origin of circumcision is not known with certainty; however, artistic and literary evidence from ancient Egypt suggests it was practiced in the ancient Near East from at least the Sixth Dynasty (c. 2345–2181 BCE). According to some scholars, it appears that it only appeared as a sign of the covenant during the Babylonian Exile. Scholars who posit the existence of a hypothetical J source (likely composed during the seventh century BCE) of the Pentateuch in Genesis 15 hold that it would not have mentioned a covenant that involves the practice of circumcision. Only in the P source (likely composed during the sixth century BCE) of Genesis 17 does the notion of circumcision become linked to a covenant.

Some scholars have argued that it originated as a replacement for child sacrifice.

According to the Hebrew Bible, Adonai commanded the biblical patriarch Abraham to be circumcised, an act to be followed by his descendants:

This is My covenant, which ye shall keep, between Me and you and thy seed after thee: every male among you shall be circumcised. And ye shall be circumcised in the flesh of your foreskin; and it shall be a token of a covenant betwixt Me and you. And he that is eight days old shall be circumcised among you, every male throughout your generations, he that is born in the house, or bought with money of any foreigner, that is not of thy seed. He that is born in thy house, and he that is bought with thy money, must needs be circumcised; and My covenant shall be in your flesh for an everlasting covenant. And the uncircumcised male who is not circumcised in the flesh of his foreskin, that soul shall be cut off from his people; he hath broken My covenant.