The Democracy Defense Fund (DDF) was a project formed in March 2017 to match up donors interested in safeguarding liberal democracy in the United States with subject matter experts familiar with effective giving opportunities.

DDF had two funds: a Democratic Participation Fund and a Free Press Fund. It awarded grants to three organizations: Repairers of the Breach, Forward Justice, and Reporters Committee for Freedom of the Press.

DDF's team consisted of Barbara Fried, a Professor of Law at Stanford Law School, and Connor Flexman.