Creates the Illinois Psilocybin Advisory Board Act. Sets forth findings and defines terms. Establishes the Illinois Psilocybin Advisory Board within the Department of Financial and Professional Regulation for the purpose of advising and making recommendations to the Department regarding the provision of psilocybin and psilocybin services. Sets forth requirements for members of the Board. Provides that, within 3 months after the effective date of the Act, the Governor, the Senate President, the Speaker of the House, the Minority Leader of the House, and the Minority Leader of the Senate shall appoint certain individuals to the Board. Provides that, between January 1, 2027 and January 1, 2029, the Board shall meet at least once every 2 calendar months at a time and place determined by the chairperson or a majority of the voting members of the Board and that, after January 1, 2029, the Board shall meet at least once every calendar quarter. Provides that the Board shall perform certain duties, including publishing an annual report describing the Board's activities and making recommendations concerning (i) the safety and efficacy of psilocybin and other substances, (ii) potential requirements for providing psilocybin services to clients, (iii) a potential code of ethics and possible training requirements for facilitators, and (iv) public health considerations. Makes other changes. Effective immediately.