Temple Sinai is a Jewish Reform congregation in Las Vegas, Nevada. It was founded in 2007 when Temple Beth Am and Congregation Adat Ari El merged. Temple Sinai has over 300 member families and its sub-groups include a Sisterhood, Men’s Club, Chavurah, Youth Group, and committees. Kenneth Segel was the first rabbi of Temple Sinai and was succeeded by Rabbi Malcolm Cohen in 2009.

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.