The United States has led the international community in imposing economic sanctions on Iran, in an effort to change the government of that country's support of acts of international terrorism, poor human rights record, weapons and missile development and acquisition, role in regional instability, and development of a nuclear program. This report identifies the legislative bases for sanctions imposed on Iran, and the nature of the authority to waive or lift those restrictions. It comprises two tables that present legislation and executive orders that are specific to Iran and its objectionable activities in the areas of terrorism, human rights, and weapons proliferation. It will be updated if and when new legislation is enacted, or, in the case of executive orders, if and when the President takes additional steps to change U.S. policy toward Iran. Other CRS reports address the U.S.-Iran relationship, including a comprehensive discussion of the practical application of economic sanctions: CRS Report RS20871, Iran Sanctions, by Kenneth Katzman. See also CRS Report R43333, Interim Agreement on Iran's Nuclear Program, by Kenneth Katzman and Paul K. Kerr; CRS Report R43492, Achievements of and Outlook for Sanctions on Iran, by Kenneth Katzman; CRS Report RL32048, Iran: U.S. Concerns and Policy Responses, by Kenneth Katzman; and CRS Report R40094, Iran's Nuclear Program: Tehran's Compliance with International Obligations, by Paul K. Kerr.