Yakin Yarmuk wani babban yaki ne tsakanin sojojin daular Rumawa da dakarun musulmi na Khalifancin Rashidun .Yaƙin ya ƙunshi jerin gwanon da aka yi na kwanaki shida a watan Agusta 636, kusa da Kogin Yarmouk, kusa da iyakar Syria – Jordan da Syria – Isra’ila , kudu maso gabashin Tekun Galili.Sakamakon yakin ya kasance cikakken nasarar musulmi wanda ya kawo karshen mulkin Rumawa a kasar Sham.Yakin Yarmuk ana daukarsa a matsayin daya daga cikin yakoki mafi muhimmanci a tarihin soji, kuma shi ne karon farko da musulmin farko suka fara yakar musulmi bayan wafatin annabin musulunciMuhammad , wanda ke sanar da ci gaban musulunci cikin sauri zuwa ga mabiya addinin kirista na lokacin. .Don duba ci gaban Larabawa da kuma dawo da yankin da ba a so, Sarkin sarakuna Heraclius ya aika da gagarumin balaguro zuwa ga Levant a watan Mayu 636. Kamar yadda sojojin Rumawa suka gabato, Larabawa sun janye daga Siriya da dabara kuma suka tattara dukan sojojinsu a filin Yarmuk kusa da Larabawa. Peninsula, inda aka ƙarfafa su, kuma suka ci nasara da manyan sojojin Byzantine.Yakin da ake yi wa kallon shi ne babban nasarar da Khalid bn al-Walid ya samu na soji tare da tabbatar da sunansa na daya daga cikin manyan mayaka da kwamandojin dawakai a tarihi.