The Discovery Institute (DI) is a politically conservative think tank that advocates the pseudoscientific notion of intelligent design (ID). It was founded in 1991 in Seattle as a non-profit offshoot of the Hudson Institute. It has been denounced as a "propaganda mill" by various prominent critics.

Its "Teach the Controversy" campaign aims to permit the teaching of anti-evolution, intelligent-design arguments in United States public high school science courses in place of accepted scientific theories, positing that a scientific controversy exists over whether evolution is a reality, when in fact there is none.

The institute was cofounded in 1991 by Bruce Chapman and George Gilder as a non-profit educational foundation and think tank. It was started as a branch organization of the Hudson Institute, an Indianapolis-based conservative think tank. It is named after the Royal Navy ship HMS Discovery in which George Vancouver explored Puget Sound in 1792. The organization was incorporated in 1991.

Discovery Institute Press is the institute's publishing arm and has published intelligent design books by its fellows including David Berlinski's Deniable Darwin & Other Essays (2010), Jonathan Wells' The Myth of Junk DNA (2011) and an edited volume titled Signature Of Controversy, which contains apologetics in defense of the institute's Center for Science and Culture director Stephen C. Meyer.

The Physicians and Surgeons for Scientific Integrity (PSSI), formally registered as PSSI International Inc., is a United States 501(c)(3) nonprofit anti-evolution organization, based in Clearwater, Florida, promoting the pseudoscience of intelligent design associated with the Discovery Institute. While in the past, the organization sponsored events promoting intelligent design and fundamentalist Christianity, it is currently largely inactive. The PSSI was established in early 2006 by Rich Akin. Geoffrey Simmons, Discovery Institute fellow, is one of the directors of the PSSI.

The PSSI created a public list of medical professionals who dissent from Darwinism. This list is used by the Discovery Institute in its anti-evolution campaigns. The list is used in support of the Discovery Institute claims that intelligent design is scientifically valid while asserting that evolution lacks broad scientific support.

The PSSI, which was active between 2006 and 2008, held a "Doctors Doubting Darwin" rally at the University of South Florida's Sun Dome in September 2006. Attendance was estimated at 3,500 to 4,000 people by a local reporter. Apologetic organizations promoting the event had hoped to fill all 7,700 seats in the Sun Dome. This meeting featured the Discovery Institute's Jonathan Wells and fellow Michael Behe, and received local radio coverage. This rally was opposed by the Florida Citizens for Science.

Teach the Controversy is a campaign conducted by the Discovery Institute to promote the pseudoscientific principle of intelligent design, a variant of traditional creationism, while attempting to discredit the teaching of evolution in United States public high school science courses.