Congregation Adat Ari El was a Jewish Reform congregation in Las Vegas, Nevada founded by former members of Temple Beth Am in 1992. The congregation started out with about 15 families that held services in a donated storefront every two weeks, led by a rabbi who traveled from California. In 2007, Adat Ariel merged with Temple Beth Am to form Temple Sinai.

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Temple Beth Am was a Jewish Reform congregation founded by Rabbi Mel Hecht in 1984 in Las Vegas, Nevada. In 1992, some members of the congregation, unhappy with Rabbi Hecht's leadership, broke off to form Congregation Adat Ari El. Construction on Beth Am's campus began in Summerlin in 2001. In 2007 Temple Beth Am and Adat Ari El merged to form Temple Sinai.

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