The Society for Industrial and Applied Mathematics (SIAM) Science Policy Fellowship Program develops post-doctoral fellows and early career researchers into strong advocates for U.S. federal support in applied mathematics and computational science. Three to five fellowship recipients will be selected each year to serve two-year terms that include in-person and remote training; attending biannual SIAM Committee on Science Policy meetings; interfacing with federal officials; and participating in an advocacy day on Capitol Hill in Washington, D.C. The Program enables participants to gain in-depth knowledge of the policy processes that determine science funding and policy decisions while still pursuing their research and teaching. Applicants must be SIAM members in good standing.