Bill Siegel (December 24, 1962 – December 11, 2018) was an American documentary film producer and director. Documentaries directed by Siegel include Emmy Award-winning The Trials of Muhammad Ali and the Academy Award-nominated The Weather Underground in 2003.

He once worked for Kartemquin Films, which announced his unanticipated death the day after from unspecified causes.He wrote The Control Factor:Our Struggle to See the True Threat, described as exploring "the psychological maneuvers, fantasies, and entanglements we engage in to avoid clearly seeing the Islamic threat that confronts us" by its publisher. The book criticizes Barack Obama's treatment of what Siegel calls the Muslim threat.In 2013 he wrote that "any objective review of Obama's actions to date would conclude that Obama is properly described as the "Muslim Uncle" or even the "Muslim Godfather" (the Mafia had its roots in Islamic controlled Sicily) as he consistently promotes, protects, and oversees the Brotherhood's interests "over there.""Monica Crowley promoted a column by Siegel in which he called Obama an "Islamic community organizer" and wrote that 'The administration, with Obama as Islamic community organizer, is not only placating Muslims and, in particular, our Islamic enemies; it is conforming US policy to Islam and Sharia,... and accused him of trying to "do as little as politically possible so as to foment chaos across the region, all to the benefit of his seeming policy "companions" dedicated to promoting Sharia and Islamic statehood- the Muslim Brotherhood and the Islamic Republic of Iran..."