SFI may refer to:
Organisations St. Francis Institution, a school in Melaka, Malaysia Santa Fe Institute, a theoretical research institute located in Santa Fe, US Saturday Football International, Taiwanese football club Science Foundation Ireland, the statutory body in the Republic of Ireland for funding basic science research Seattle Film Institute, a film school SFI Foundation (formerly SEMA Foundation), an organization administering equipment standards for motor sport Software Freedom International, a US non-profit company that coordinates Software Freedom Day STARFLEET: The International Star Trek Fan Association, Inc. Students' Federation of India, a left wing student organisation in India Sustainable Forestry Initiative, a forest certification standard and program of SFI Inc. Swedish Film Institute, for the Swedish film industry Swedish for immigrants, the national free Swedish language course Swimming Federation of India, the national governing body for aquatic sports in India Swiss Finance Institute, a Swiss research and scientific educational institute in the areas of banking and finance
Technology Sequential fuel injection system SerDes Framer Interface, a standard for telecommunications Simple Firmware Interface, Intel's lightweight method for firmware to export static tables to the operating system Solar Flux Index, measure of solar radio flux per unit frequency
Transportation Secure Freight Initiative, a US Department of Homeland Security program
Other uses
Postal code for Safi, Malta Sporadic fatal insomnia