Preventing Future Pandemics Act of 2021 This bill establishes measures to address global public health risks posed by wildlife markets, which are commercial markets that sell or slaughter wildlife for human consumption as food or medicine in communities where alternative nutritional or protein sources are available. Specifically, the bill prohibits importing, exporting, purchasing, or selling live wild animals in the United States for human consumption as food or medicine. The Department of the Interior must hire, train, and deploy at least 50 new U.S. Fish and Wildlife Service law enforcement attachés around the world, and the U.S. Agency for International Development must increase specified activities to address the threats and causes of zoonotic (animal-to-human transmission) disease outbreaks. Additionally, the United States must work with other United Nations member states to urge a global ban on commercial wildlife markets and enforcement of laws to end wildlife trafficking. Further, the President may impose sanctions against a foreign country or foreign nationals that the Department of State has determined are taking certain actions that enable or facilitate commercial wildlife markets. Among other reports required by the bill, the National Academies of Sciences, Engineering, and Medicine must conduct a study and submit a report that includes an evaluation of (1) the impact that consumption of terrestrial wildlife as food or medicine has on the transmission of novel viral and other pathogens, (2) the role of consuming terrestrial wildlife as food or medicine in the transmission of microbes from animals to humans, and (3) the conditions at live wildlife markets that lead to this transmission.