Aharon Yaakov Schwei (July 9, 1934 – April 24, 2020)^[1] was an Orthodox rabbi and a member of the Chabad Hasidic movement. Rabbi Schwei served on the Bais Din Tzedek (Jewish Rabbinical Court) of the Chabad community in Crown Heights, Brooklyn.^{[2][3][4][5][6]}

As a member of the Crown Heights Beth Din (rabbinical court), Rabbi Schwei was considered ^{[by whom?]} one of the community's chief rabbis (Aramaic, מרא דאתרא (Marah D'Asra)).^[7] The rabbinical court is the spiritual and religious body governing the Crown Heights Chabad community. After his death, three rabbis remained serving on the Beth Din:

• Rabbi Avraham Osdoba, the Av Beth Din (head of court).
• Rabbi Yosef Heller
• Rabbi Yosef Braun

Each hold the title Marah D'Asra.^{[2][3][4][5][6]}

Rabbi Schwei received his rabbinic ordination from Rabbi Aryeh Leib Kramer, the former dean of the Chabad yeshiva in Montreal.^[15]

Yaakov Schwei's brother, Rabbi Isaac Schwei (1932–1988) was a rabbi in the Chabad community of Montreal (also ordained by Rabbi Aryeh Leib Kramer).^[15]

In December 2013, Rabbis Yaakov Schwei and Yosef Braun issued a letter stating that attending programs run by Call of the Shofar, a Jewish LGAT group based in Baltimore, is forbidden under Jewish law.^[16][17] They were later joined by the "Central Committee of Chabad-Lubavitch Rabbis in the United States and Canada," also known as Vaad Rabbonei Lubavitch who also banned COTS.^[18][19]

On April 24, 2020, Rabbi Schwei died in Brooklyn from complications associated with COVID-19.