Haemoglobin wani furotin ne da ake samu a cikin jajayen kwayoyin halitta wanda ke da alhakin daukar iskar oxygen daga huhu zuwa kyallen jikin jiki da kuma jigilar carbon dioxide daga kyallen zuwa huhu don fitar da shi. Ya ƙunshi sarƙoƙi na furotin guda huɗu (globins) da ƙungiyoyin heme guda huɗu, waɗanda ke ɗauke da atom ɗin ƙarfe waɗanda ke ɗaure da oxygen da carbon dioxide. Kalmar “hemoglobin” ta fito ne daga kalmomin Helenanci “haima,” ma’ana jini, da “globin,” ma’ana sunadaran gina jiki.