The U.S. Department of Energy's Golden Field Office has issued a Request for Information (RFI) titled "DE-FOA-0003535" to gather insights on defining Sustainable Maritime Fuels (SMF) in the United States. This initiative aims to engage industry, government, and maritime stakeholders to provide feedback on various aspects that will shape the definition of SMF, including carbon intensity reductions, sustainability factors, and acceptable feedstocks, as the maritime industry transitions towards zero- and near-zero-emission fuels. The RFI is part of a broader Action Plan for Maritime Energy and Emissions Innovation, emphasizing the need for a collaborative approach among multiple federal agencies, including the Departments of Transportation, Agriculture, and the Environmental Protection Agency. Responses to the RFI must be submitted electronically by February 28, 2025, to DefiningSMF@ee.doe.gov, with a maximum length of three pages in Microsoft Word format. This opportunity does not involve funding or applications, but rather seeks to inform future definitions and standards for sustainable maritime fuels.