NIH Small Research Grant Program

NIH R03 Small Research Grant — Parent PA

Supports focused United States. research projects through recurring small grant NIH pathways.

The NIH R03 Small Research Grant Program funds discrete, self-contained research projects that can be completed within two years and do not require the scale of an R01. The parent announcement PA-25-302 (Clinical Trial Not Allowed) was issued December 18, 2024, opened January 16, 2025, and remains active through January 8, 2028. New application deadlines are February 16, June 16, and October 16 each year; renewal and resubmission deadlines fall on March 16, July 16, and November 16. Like R01 and R21 parent PAs, R03 is open to any NIH Institute or Center topic area, and topic alignment with the target IC's program priorities is the single most important application strategy.

The R03 is limited to a two-year period of performance. Direct cost limits are not set in the parent announcement but are determined by each IC individually; many ICs cap R03 direct costs at $50,000 per year. Eligible applicant organizations include domestic universities, research hospitals, nonprofits, and for-profit companies with biomedical research capacity; individual applicants cannot apply without institutional affiliation. The mechanism is suited for pilot and feasibility studies, secondary data analysis, development of research tools or methodologies, and small clinical studies — applications proposing long-term research programs are a poor fit.

The R03 competes in the same three-cycle peer review calendar as the R21. Applications are assigned to a Center for Scientific Review study section, scored on the NIH 1–9 scale, reviewed by the target IC's National Advisory Council, and funded within the IC's annual budget. Investigators should confirm with the target IC's program officer that the IC accepts R03 applications before submission, as some ICs have opted out of the parent PA. The R03 is a practical entry point for early-career investigators establishing a track record prior to submitting a larger R01 or R21 application.