Yaƙin Duniya na I da turanci World War I (ana kintse sunan WWI ko WW1), kuma ana kiran shi da First World War da turanci wato Yakin Duniya na Farko kuma Great War wato Babban Yaki, wani Yakin Duniya ne da ya faro daga nahiyar Turai wanda aka fara tun daga 28 ga watan Juli na 1914 har zuwa 11 ga watan Nuwanban 1918. Wanda ayanzu ake dangata shi da suna "the war to end all wars" wato Yakin da zai tsaida Yakoki, ya kai ga hada fiye da miliyan 70 million na ma'aikatan soja, da miliyan 60 na Turawa, wanda yasa yazama daya daga cikin babban yaki daya daga cikin yakin da aka rasa rayuka da dama a tarihi, an kiyasta kusan mutane miliyan 9 Mayaƙa aka rasa da miliyan 7 na farin hula wadanda suka mutu sanadiyar yakin, wanda ya haifar da kisan kiyashi da kuma cutar da kuma rasa rayukan Mutane miliyan 50 zuwa 100 a duniya baki daya.