David Yerushalmi (born 1956) is an American Orthodox Jewish attorney and conservative political activist based in Arizona and New York. A native of Brooklyn, New York, he is an alumnus of Cardozo Law School. Yerushalmi specializes in constitutional and national security law, with a focus on securities law, immigration, religious freedom, and opposition to Sharia law. He is the founder and president of the Society of Americans for National Existence (SANE), an anti-Islam advocacy group established in 2006 that promotes efforts to criminalize Sharia law.

Yerushalmi co-founded the American Freedom Law Center (AFLC) in 2011 with Robert Muise, serving as senior counsel and president. He is also a co-founder of the American Freedom Defense Initiative. Widely regarded as the architect of the anti-Sharia law movement in the United States, he drafted the model "American Laws for American Courts" (ALAC) legislation, which has been adopted by multiple states to restrict the application of foreign or religious laws in courts. His activism includes anti-Sharia litigation, counter-terrorism legal initiatives, challenges to Sharia implementation in the U.S., defending far-right activists, representing counter-jihad organizations in free speech cases, and handling civil rights cases involving minorities within Muslim communities.

In the 1990s, Yerushalmi served as counsel and senior policy research director at the neoconservative Institute for Advanced Strategic and Political Studies, with offices in Jerusalem and Washington, D.C. He launched the "Mapping Sharia in America" campaign in 2007, a project aimed at analyzing mosques for signs of radicalism, and acts as general counsel for the Center for Security Policy. He has provided legal counseling to anti-Muslim groups such as Stop Islamization of America and Stop the Madrassa, and is considered part of a broader Islamophobia network. Although he lacks formal training in Sharia law, he authored a critique of Sharia-compliant finance published in the Utah Law Review in 2008.

Yerushalmi’s activism has generated significant controversy. The Southern Poverty Law Center identifies him as a key figure in the U.S. anti-Muslim hate movement. Jewish organizations, including the Anti-Defamation League, have condemned his inflammatory statements regarding America's "white, male-dominated, Christian" roots and his targeting of "radical liberal Jews" and progressive elites.