Nan Aron is an American lawyer and the founder and president of Alliance for Justice (AFJ), a liberal judicial advocacy group in the United States. Staunchly progressive, Aron has been a noted opponent of conservative judicial nominees in the United States. She repeatedly called for former Presidents Bill Clinton and Barack Obama to be more aggressive in nominating progressives to the bench, and during George W. Bush's presidency, urged the Democrat-controlled Senate to consider Bush's nominees closely. She is considered a key player in confirmation hearings for judicial nominees, and, in 2005, was called "the Madame Defarge of liberal court watchers" in the Wall Street Journal.