Browse Conspiracy Theories

The claim, promoted by Soviet KGB disinformation Operation Denver/INFEKTION (1983-1987) and subsequent circulation, that HIV/AIDS was created by the US CIA or US Army Fort Detrick biological weapons program.

Condensation trails (contrails) are the normal ice crystal trails formed behind aircraft at high altitude when hot, humid engine exhaust meets cold air. Distinct from the "chemtrail" conspiracy theory, which claims these trails contain deliberate chemical spraying programs.

The October 1, 2017 mass shooting at the Route 91 Harvest country music festival in Las Vegas, which killed 60 and wounded over 400 — the deadliest mass shooting in modern US history. Various conspiracy theories claim multiple shooters, ISIS involvement, MGM/security cover-up, or government-directed false-flag operations.

The July 16, 1999 crash of a small aircraft off Martha's Vineyard piloted by John F. Kennedy Jr., killing him, his wife Carolyn Bessette, and sister-in-law Lauren Bessette. Conspiracy claims allege assassination by the Clintons, a senior Kennedy family cabal, or staged disappearance — the latter a QAnon staple.

The false claim that the April 15, 2013 Boston Marathon bombing was staged by the US government or involved "crisis actors" rather than being conducted by the Tsarnaev brothers. The real bombing killed 3 people and injured 260+.

The Bush administration's 2002-2003 claim that Saddam Hussein's Iraq had operational ties to al-Qaeda, used as a central justification for the 2003 US invasion. The 9/11 Commission, Senate Intelligence Committee reports, and a 2006 Pentagon IG report all concluded no such operational relationship existed.

The July 20, 1993 death of Deputy White House Counsel Vincent Foster in Fort Marcy Park, Virginia, officially ruled suicide by five separate investigations. Conspiracy claims allege murder by the Clintons or a cover-up of connections to Whitewater or Hillary Clinton.

The false claim, most prominently promoted by Alex Jones and Infowars, that the December 14, 2012 Sandy Hook Elementary School shooting in Newtown, Connecticut was staged by "crisis actors" to justify gun control legislation. The shooting killed 20 first-graders and 6 adults.

A satirical movement launched in 2017 by Peter McIndoe claiming that all birds in the United States were exterminated by the CIA between 1959-2001 and replaced with surveillance drones. Designed as parody, it was widely shared without the satire being recognized.

The claim, based on a 1984 packet of allegedly leaked documents, that President Truman in 1947 established a secret committee (Majestic 12 or MJ-12) of 12 scientists and military officers to study recovered UFO craft from Roswell.

The claim that Earth is hollow, with inner surfaces, inhabitants, or openings at the poles. Versions include the 17th-century scientific proposal by Edmond Halley, 19th-century Symmes Hole theory, and 20th-century Nazi/UFO-adjacent versions.

TWA Flight 800 (Boeing 747) exploded and crashed off Long Island on July 17, 1996, killing all 230 aboard. The NTSB ruled the cause was an ignition of flammable fuel-air vapor in the center wing fuel tank. Claims of a Navy missile strike or terrorist attack have persisted.

A fabricated antisemitic text, first published in Russia in 1903, claiming to document a Jewish plan for world domination. Extensively proven a forgery — plagiarized from Maurice Joly's 1864 Dialogue aux enfers entre Machiavel et Montesquieu (a satire about Napoleon III, not Jews).

Claims that Denver International Airport (opened 1995) houses an underground New World Order bunker, hosts occult murals, and that its dedication capstone contains coded Freemason messages.

The claim, popularized by British writer David Icke from 1999 onward, that a race of shape-shifting reptilian humanoids from Alpha Draconis secretly rule the Earth by posing as political and royal elites including the British Royal Family.

Claims that a secret US military base at Camp Hero in Montauk, New York ran experiments on time travel, mind control, teleportation, and contact with extraterrestrials from 1971 to 1983.

Claims that the US Air Force HAARP (High-frequency Active Auroral Research Program) facility in Gakona, Alaska is used for weather modification, earthquake generation, or mass mind control.

The claim that the antiparasitic drug ivermectin is an effective COVID-19 treatment being suppressed by pharmaceutical companies, regulators, and hospitals to protect vaccine profits.

The false claim that the MMR vaccine causes autism, originating in a fraudulent 1998 study by Andrew Wakefield published in The Lancet, which the journal formally retracted in 2010 after investigation revealed data manipulation and undisclosed financial conflicts.

The 1997 death of Diana, Princess of Wales in a Paris car crash has spawned decades of conspiracy theories alleging assassination by British intelligence, the Royal Family, or other state actors — most forcefully championed by Mohamed Al-Fayed, father of Dodi Fayed who died in the same crash.

The claim that the US Navy conducted an October 1943 experiment at the Philadelphia Naval Shipyard that made the destroyer USS Eldridge temporarily invisible and teleported it to Norfolk, Virginia — with horrific effects on crew members.

The phenomenon where large groups of people share a vivid but false memory of historical events, objects, or media — coined by researcher Fiona Broome in 2009 after noticing many people falsely remembered Nelson Mandela dying in prison in the 1980s.

A sprawling conspiracy movement originating on 4chan and 8chan in October 2017, centered on anonymous "Q" posts alleging that a cabal of Satan-worshipping pedophile elites controls government, media, and finance, and that Donald Trump is leading a secret war to expose them.

The false claim that a child sex-trafficking ring linked to Democratic Party officials operated out of Comet Ping Pong pizzeria in Washington DC, based on misreadings of John Podesta's hacked 2016 emails.