The　speed　of　sound　in　ethanol　was　measured　in　liquid,　near-critical　and　supercritical　fluid　over　the　temperature　range　from　(298.52–655.67)　K　along　five　isobaric　lines　from　(0.1–9.0)　MPa　from　Rayleigh-Brillouin　light　scattering　spectroscopy.　The　expanded　relative　uncertainty　for　the　reported　speed　of　sound　is　estimated　to　be　1.3%　with　the　level　of　confidence　of　0.95　(coverage　factor　k　=　2).　The　correlation　for　experimental　speeds　of　sound　in　liquid　ethanol　are　presented,　and　the　averaged　absolute　percentage　deviation　between　the　calculated　values　and　literature　data　is　0.16%.　The　variation　tendencies　of　the　speed　of　sound　in　ethanol　with　increasing　temperature　and　pressure　were　illustrated　over　the　whole　investigated　p-T　region.　The　accuracy　of　the　three　fundamental　equations　available　in　the　NIST　Standard　Reference　Database　23　were　assessed　by　the　experimental　speeds　of　sound　in　ethanol.　©　2020　Elsevier　B.V.