Tree of Life – Or L'Simcha Congregation (Hebrew: עֵץ חַיִּים – אוֹר לְשִׂמְחָה‎) is a Conservative Jewish synagogue in the Squirrel Hill neighborhood of Pittsburgh, Pennsylvania. The congregation moved into its present synagogue building in 1953. It merged with Congregation Or L'Simcha in 2010, bringing its membership to 530 families. In 2018, the synagogue was the target of a mass shooting in which eleven people were killed and seven injured. It was the deadliest attack on the Jewish community in the United States.