Yaƙin Yunwa ko Yaƙin Yunwa ɗan taƙaitaccen rikici ne tsakanin Masarautar ƙawance ta Poland , da Grand Duchy na Lithuania, a kan Teutonic Knights a lokacin rani 1414 a ƙoƙarin warware rikicin yanki.Yakin ya samu sunansa ne daga munanan dabarun lalata da bangarorin biyu suka bi.Yayin da rikici ya ƙare ba tare da wani babban sakamako na siyasa ba, yunwa da annoba sun mamaye Prussia.A cewar Johann von Posilge, 86 friars na Teutonic Order sun mutu daga annoba bayan yakin.Idan aka kwatanta, kusan 200 friars sun halaka a yakin Grunwald na 1410, daya daga cikin manyan fadace-fadace a Turai ta tsakiyar zamani.