National Science Foundation (NSF) - Postdoctoral Research Fellowships in Biology (PRFB)

Archived administrative guide for Postdoctoral Research Fellowships in Biology (NSF 24-113). The latest version is NSF 25-032.

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DeadlineFourth Tuesday in September, Annually Thereafter

Award amountFellowship Stipend

Last checkedJun 25, 2026

PDF guide

PRFB Reference Letter Author Submission Guide

Guide for reference letter authors on submitting letters for the NSF Postdoctoral Research Fellowships in Biology (PRFB) program via Research.gov.

Official source Source page

Requirements

Must have an NSF account in Research.gov; Reference letter must be uploaded as a PDF; Reference letter can be replaced before the deadline

Application materials

Reference letter

How to apply

Register for an NSF account in Research.gov; Sign into Research.gov and access the Reference Letter Submission system; Select or add the postdoctoral fellowship proposer; Upload the reference letter PDF and make a rating selection; Submit the reference letter and rating to NSF

Contact

1-800-381-1532 (7:00 AM - 9:00 PM ET; Monday - Friday except federal holidays) or via rgov@nsf.gov

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