EFS may refer to: Medicine and science Embryonal fyn-associated substrate, encoded by the EFS gene Enhancer-FACS-seq, a medical assay Estonian Physical Society () Technology Canon EF-S lens mount Emergency flotation system, installed on helicopters Computing Amazon Elastic File System, a file storage service Electronic Filing System, of the Singapore Judiciary Electronic Filing System (USPTO), of United States Patent and Trademark office Extent File System, used in the IRIX operating system Encrypting File System, the encryption subsystem of the NTFS file system Other uses Emergency Fire Service, now the South Australian Country Fire Service Equal Franchise Society, a defunct American women's suffrage advocacy group Estrada de Ferro Sorocabana, a Brazilian railway Exchange of futures for swaps Expenditure and Food Survey, of the Office for National Statistics in Great Britain GE Energy Financial Services, an American energy infrastructure investor Swedish Evangelical Mission () Ethnological Forgery Series, a series of songs by the krautrock band Can See also EF (disambiguation) EFSS (disambiguation) ESF (disambiguation) SEF (disambiguation) SFE (disambiguation) FSE (disambiguation) FES (disambiguation)