Biodiesel　is　primarily　obtained　from　the　base　catalyzed　transesterification　reaction　of　oils　or　fats.　Biodiesel　has　become　more　attractive　due　to　its　characteristics　of　being　bio-degradable,　renewable　and　non-toxic.　Recently　biodiesel　has　been　widely　used　as　an　alternative　fuel.　Biodiesel　quality　analysis　has　become　very　important　because　consistency　and　a　higher　quality　are　paramount　to　the　success　of　its　commercialization　and　market　acceptance.　Suitable　and　precise　analytical　methods　are　needed　to　meet　this　requirement.　Some　analytical　techniques　have　been　considered　and　applied　in　biodiesel　analysis,　such　as　Chromatography　and　Spectroscopy.　Within　the　Spectroscopic　technique,　Infrared　Spectroscopy　has　played　an　important　role.　Past　reviews　on　analytical　methods　for　biodiesel　analysis　were　written　by　Knothe　and　Marcos　Roberto　Monteiro.　In　this　paper,　the　author　has　discussed　the　developments　in　biodiesel　quality　analysis　with　IR　technique.　(C)　2012　Elsevier　Ltd.　All　rights　reserved.