Ext, ext or EXT may refer to: Ext functor, used in the mathematical field of homological algebra Ext (JavaScript library), a programming library used to build interactive web applications Exeter Airport (IATA airport code), in Devon, England Exeter St Thomas railway station (station code), in Exeter, England Extended file system, a file system created for Linux Exton station (Pennsylvania) (Amtrak station code), in Exton, Pennsylvania Extremaduran language (ISO language code), spoken in Spain Extremeroller, a former roller coaster at Worlds of Fun, Kansas City, Missouri Cadillac Escalade EXT, a sport utility truck