The Delta Science Program and California Sea Grant are excited to announce the 13th round of Delta Science Fellowships, with support for the 2022-2024 academic years. This fellowship funds research projects of up to two years in duration that will advance the state of knowledge underlying high priority science issues that affect the Sacramento-San Joaquin Delta (Delta) and its management as an integrated socio-ecological system. Eligible applicants include postdoctoral researchers, Ph.D. students, and master’s students. Priority topic areas will be described and include research in both the biophysical and social sciences. For the purposes of this request for applications (RFA), biophysical science refers to biological, chemical, and/or physical science.