The Office of Polar Programs Postdoctoral Research Fellowships (OPP-PRF) are funded by the National Science Foundation (NSF) and support postdoctoral training of researchers, including social scientists, in polar research. Applicants must have completed their doctoral degree prior to the start date of the fellowship and not have worked for more than 24 months in a role requiring their doctoral training. Applicants must be citizens, nationals, or permanent residents of the USA. Research must be conducted at eligible institutions in the USA. Fellowship funding starts at 82,800 USD/year and is provided over a period of 2 years. The fellowship also provides a research supplement of 15,000 USD/year. The total amount of the fellowship is 167,800 USD. Indirect costs are not included in this Fellowship. Applicants who are women, veterans, persons with disabilities, and underrepresented minorities in STEM, or who have attended community colleges and minority-serving institutions (e.g., Historically Black Colleges and Universities, Tribal Colleges and Universities, Hispanic Serving Institutions, Alaska Native Serving Institutions, and Hawaiian Native and Pacific Islander Serving Institutions) are especially encouraged to apply. Applications are assessed annually, with closing dates on the first Monday in February. The next application closing date is February 5, 2024.