The Dulles' plan or the Dulles Doctrine (Russian: План Даллеса or Доктрина Даллеса) is the central document of a conspiracy theory, according to which the CIA chief Allen Dulles had developed a plan for United States to destroy the Soviet Union during the Cold war by secretly corrupting the cultural heritage and moral values of the Soviet nation. The plan was first published in Russia shortly after the dissolution of the USSR and was often quoted by prominent Russian politicians, journalists and writers.

The text originates from a work of fiction, a 1971 novel The Eternal Call (Russian: Вечный зов), by Anatoliy Ivanov, where it is provided in the form of an exposition by one of the novel's villains, a Nazi collaborator. It was first published as a distinct "plan" and ascribed to Allen Dulles in a 1993 book by Metropolitan Ioann of St. Petersburg and Ladoga. The literary origins of the plan were traced in the early 2000s.

The term "Dulles' Plan" may also refer to a series of out-of-context excerpts from the program NSC 20/1 ("U.S. objectives with respect to Russia") as presented by Nicolay Yakovlev in his 1983 book CIA against USSR. The original program outlined by the US National Security Council in 1948 established the basic policy towards the Soviet Union. However, this text neither has anything to do with the CIA or Allen Dulles, nor does its contents bear any textual similarity with the document presented by the supporters of the conspiracy theory.

Timothy Francis Leary (October 22, 1920 – May 31, 1996) was an American psychologist and writer, known for his advocacy of psychedelic drugs. During a time when drugs such as LSD and psilocybin were legal, Leary conducted experiments at Harvard University under the Harvard Psilocybin Project, resulting in the Concord Prison Experiment and the Marsh Chapel Experiment. Both studies produced useful data, but Leary and his associate Richard Alpert were fired from the university.

Leary believed LSD showed therapeutic potential for use in psychiatry. He popularized catchphrases that promoted his philosophy, such as "turn on, tune in, drop out", "set and setting", and "think for yourself and question authority". He also wrote and spoke frequently about transhumanist concepts involving space migration, intelligence increase and life extension (SMI²LE), and he developed the eight-circuit model of consciousness in his book Exo-Psychology (1977).

During the 1960s and 1970s, Leary was arrested regularly and was held captive in 29 different prisons throughout the world. President Richard Nixon once described Leary as "the most dangerous man in America".