Several funding agencies in the U.S. have research data sharing policies and requirements, such as requirements for data sharing and data management plans for proposals.
National Science Foundation (NSF) proposals require a data management plan, which is a one to two page document that describes how research data will be managed and shared. Different directorates provide specific guidance on the type of information that should appear in the data management plan.
National Institutes of Health (NIH) proposals requesting $500,000 or more in direct costs per year require a data sharing plan, which is a paragraph describing how research data will be shared.
National Endowment for the Humanities (NEH) proposals through the Office of Digital Humanities require a data management plan, which is a one to two page document that describes how research data will be managed and shared.
Other funding agencies also require data management plans or have policies regarding data sharing.