ReganBooks was an American bestselling imprint or division of HarperCollins book publishing house (parent company is News Corporation), headed by editor and publisher Judith Regan, started in 1994 and ended in late 2006. During its existence, Regan was called, by LA Weekly, "the world's most successful publisher". The division reportedly earned $120 million a year. ReganBooks focused on celebrity authors and controversial topics, sometimes from recent tabloids.
Prominent ReganBooks titles include Jenna Jameson’s How to Make Love Like a Porn Star, biographies by General Tommy Franks, professional wrestler Mick Foley, and radio talk show host Howard Stern, three different books on the Scott Peterson case, and those by political commentator Sean Hannity. Though ultimately owned by politically active Rupert Murdoch, ReganBooks disavowed any political agenda, publishing, for example, books both supportive of and critical of George W. Bush.
In August 2004, ReganBooks had three books on the New York Times best-seller list, including the top two non-fiction positions, and the highest profit ratio at HarperCollins.
In November 2006, ReganBooks announced plans to publish O.J. Simpson's book If I Did It; publication was later cancelled by News Corporation chairman and CEO Rupert Murdoch. After the public fallout Newsweek reported, "Regan's meddlesome-free days are almost certainly over" and Murdoch will be "clamping" down on control.
On December 15, 2006 Regan was fired from HarperCollins, allegedly over anti-Semitic comments. The staff at ReganBooks were reassigned within the HarperCollins General Book Group. The New York Times reported that ReganBooks' offices were closed and "a stunned Ms. Regan was confronted by security guards who arrived with boxes and ordered her to leave." Regan sued News Corporation for $100 million for defamation over the anti-Semitism charge, asserting that it was "completely fabricated"; in January 2008 News Corporation settled the lawsuit and publicly stated, "After carefully considering the matter, we accept Ms. Regan's position that she did not say anything that was anti-Semitic in nature, and further believe that Ms. Regan is not anti-Semitic."
Books published 
- Bodansky, Yossef. The Secret History of the Iraq War. (ReganBooks, 2005) ISBN 0-06-073680-1
- Boortz, Neal; Linder, John. The FairTax Book. (ReganBooks, 2005) ISBN 978-0-06-087541-1
- Bork, Robert H. Slouching Towards Gomorrah: Modern Liberalism and American Decline. (ReganBooks, 1996) ISBN 0-06-039163-4.
- Canseco, Jose. Juiced: Wild Times, Rampant 'Roids, Smash Hits, and How Baseball Got Big. (ReganBooks, 2005) ISBN 0-06-074640-8
- Dickinson, Janice. No Lifeguard on Duty: The Accidental Life of the World's First Supermodel. (ReganBooks, 2002) ISBN 0-06-000946-2
- Dux, Frank. The Secret Man: An American Warrior's Uncensored Story. (ReganBooks, 1996) ISBN 0-06-039152-9
- Foley, Mick. Foley Is Good: And the Real World Is Faker than Wrestling. (ReganBooks, 2002) ISBN 0-06-103241-7
- Gibson, John. Hating America: The New World Sport. (ReganBooks, 2005) ISBN 0-06-076051-6
- Hannity, Sean. Deliver Us From Evil: Defeating Terrorism, Despotism, and Liberalism (ReganBooks, 2004) ISBN 0-06-058251-0
- Hannity, Sean. Let Freedom Ring: Winning the War of Liberty over Liberalism (ReganBooks, 2002) ISBN 0-06-051455-8
- Feldschuh, Michael. The September 11 Photo Project. (ReganBooks, 2002) ISBN 0-06-050866-3
- Jameson, Jenna. How to Make Love Like a Porn Star: A Cautionary Tale. (ReganBooks, 2004) ISBN 0-06-053909-7
- Maguire, Gregory. Wicked: The Life and Times of the Wicked Witch of the West. (ReganBooks, 1995) ISBN 0-06-039144-8
- Payne, Patricia. Sex Tips from a Dominatrix. (ReganBooks, 1999) ISBN 0-06-039287-8
- Simpson, O.J. If I Did It. (Cancelled in November 2006)
- Thompson, Paul. The Terror Timeline. (ReganBooks, 2004) ISBN 0-06-078338-9
- Taormino, Tristan. Down and Dirty Sex Secrets. (ReganBooks, 2003) ISBN 0-06-098892-4
- "The Gathering Storm" by Brendan Bernhard, LA Weekly, June 2, 2005
- Roberts, Johnnie (December 2006). "publishing: No More Free Rein For Regan". Newsweek. Retrieved 2006-10-29.
- "Trend-Setting Publisher Plans To Move to and Go Hollywood" by Edward Wyatt, New York Times, April 12, 2005
- "ReganBooks Moving to Hollywood", The Book Standard, April 12, 2005
- "Political but Not Partisan: A Publisher Has It Both Ways", by Edward Wyatt, New York Times, October 13, 2004
- "The Devil and Miss Regan" by Judith Newman, January 2005, Vanity Fair
- Bosman, Julie; Siklos, Richard (December 18, 2006). "Fired Editor’s Remarks Said to Have Provoked Murdoch". New York Times. Retrieved 2006-12-18.
- Wyatt, Edward (December 15, 2006). "Judith Regan Is Fired After O. J. Simpson Book". New York Times. Retrieved 2006-12-16.
- Italie, Hillel (January 25, 2008). "Judith Regan Lawsuit Is Settled". Associated Press. Retrieved January 22, 2012.