Lambda hyperon, wanda kuma aka sani da barbashi na lambda, nau'in barbashi ne na subatomic a cikin ilimin kimiyyar lissafi. Musamman, baryon ne, ma'ana ya ƙunshi quarks guda uku. Ƙirƙirar quark na lambda hyperon shine sama quark, ɗaya ƙasa quark, da kuma wani baƙon quark, wanda ake nunawa a matsayin uds.Kalmar "lambda" ta fito ne daga harafin Helenanci λ (lambda), wanda ana amfani da shi don wakiltar wannan barbashi a cikin lissafin lissafi da adabi. Hyperon yana nufin gaskiyar cewa nau'in baryon ne wanda ke ɗauke da aƙalla baƙon quark guda ɗaya. Tsayayyen barbashi ne, ma’ana baya rubewa zuwa wasu barbashi sai dai idan ya yi mu’amala da wasu barbashi a karo. An fara gano lambda hyperon ne a cikin hasken sararin samaniya a cikin 1947, kuma tun daga lokacin an yi nazari sosai a gwaje-gwajen kimiyyar lissafi don fahimtar mahimman abubuwan kwayoyin halitta.