Tovia Singer is a rabbi, and founder and director of Outreach Judaism.

Singer is the founder and director of Outreach Judaism, a Jewish counter-missionary organization. It describes itself as "an international organization that responds directly to the issues raised by missionaries and cults, by exploring Judaism in contradistinction to fundamentalist Christianity." Singer cautions regarding congregations that "are designed to appear Jewish, but are actually fundamentalist Christian churches, which use traditional Jewish symbols to lure the most vulnerable of our Jewish people into their ranks". Singer brought Guma Aguiar to Judaism; Aguiar was born to a Jewish mother, but raised as a Christian. Outreach Judaism was described by J. Gordon Melton in 2002 as an example of "the current state of Jewish counter-cult activity".

From 2002 to 2010 Singer hosted The Tovia Singer Show on Arutz Sheva's Israel National Radio. When Mel Gibson’s film The Passion of the Christ was released, Singer stated on his 25 September 2003 show that "by the time the first nail is hammered into the cross, viewers in Germany will be passing around knife sharpeners in the theater." Following the movie's debut, J. Shawn Landres and Michael Berenbaum wrote, "not only was [Singer's prediction] inappropriate but also proved itself entirely wrong, as Germany was the only country in which leaders of the Roman Catholic, Protestant and Jewish communities cooperated to issue a joint statement criticizing The Passion."