A ranar 19 ga watan Maris din shekarar 2003 ne Amurka ta jagoranci mamaye kasar Iraki, wanda ke zama farkon yakin kasar Iraki, wanda aka fara a ranar 19 ga watan Maris din shekarar 2003 tare da kai farmaki ta sama, sannan ta kai hari ta kasa a ranar 20 ga Maris.Matakin mamayewa na farko ya ɗauki kusan wata ɗaya kawai, ^[61] yana ƙarewa tare da sanarwar shugaban Amurka George W. Bush na ƙarshen manyan ayyukan yaƙi a ranar 1 ga Mayu 2003. Wannan matakin ya ƙunshi sojoji daga Amurka, Burtaniya , Australia, da Poland , tare da Rundunar hadin gwiwa ta kwace Bagadaza a ranar 9 ga Afrilu 2003 bayan yakin kwanaki shida na Bagadaza.An kafa hukumar wucin gadi ta hadin gwiwa (CPA) a matsayin gwamnatin rikon kwarya da ta kai ga zaben majalisar dokokin Iraki na farko a watan Janairun 2005. Sojojin Amurka sun ci gaba da zama a Iraki har zuwa shekara ta 2011. ^[62]Haɗin gwiwar ya tura dakaru 160,000 a lokacin mamaya na farko, galibin Amurkawa, tare da ƙwararrun ƴan Burtaniya, da Australiya, da na Poland.Gabanin aikin ya kasance gaban taron sojojin Amurka 100,000 a Kuwait a ranar 18 ga watan Fabrairu.Hadakar dai ta samu goyon baya daga kungiyar Peshmerga a Kurdistan ta Iraki.Manufofin da aka bayyana na mamayewar su ne kwance damarar makaman kare dangi (WMD), da kawo karshen goyon bayan Saddam Hussein ga ta'addanci, da 'yantar da al'ummar Iraki.Wannan ya kasance duk da tawagar binciken Majalisar Dinkin Duniya, karkashin jagorancin Hans Blix, ba ta sami wata shaida na WMD ba kafin mamayewar.^[63] Wannan mamayar ya biyo bayan gazawar Iraqi wajen bin “damar karshe” na kwance damara, ga jami’an Amurka da na Birtaniya.^[64]An raba ra'ayin jama'a a Amurka: wani kuri'ar jin ra'ayin jama'a a watan Janairun 2003 na CBS ya nuna goyon bayan mafi rinjaye don daukar matakin soji a kan Iraki, amma kuma fifikon warware matsalar diflomasiyya da damuwa game da karuwar barazanar ta'addanci saboda yakin.Yunkurin ya fuskanci adawa daga abokan kawancen Amurka da dama, ciki har da Faransa , Jamus , da New Zealand, wadanda suka yi zargin kasancewar WMDs da hujjar yaki.Binciken da aka yi bayan yakin na makamai masu guba, tun kafin yakin Gulf na 1991, bai goyi bayan dalilin mamayewa ba.^{[65 <>]} Daga baya Sakatare-Janar na Majalisar Ɗinkin Duniya Kofi Annan ya ɗauka cewa mamayewar ba bisa ƙa'ida ba a dokokin ƙasa da ƙasa.^[66]An gudanar da zanga-zangar adawa da yaki a duniya kafin mamayewar, tare da gudanar da zanga-zangar rikodin rikodi a Rome da miliyoyin mutane suka shiga a duk duniya.^{[67 <>]} An fara kai farmakin ne da wani hari ta sama a fadar shugaban ƙasar Bagadaza a ranar 20 ga Maris, sannan aka kai hari ta ƙasa a cikin gundumar Basra da kuma kai hare-hare ta sama a faɗin ƙasar Iraki.Dakarun kawancen sun yi nasarar fatattakar sojojin Iraki cikin sauri tare da mamaye Bagadaza a ranar 9 ga Afrilu, tare da ayyukan tabbatar da wasu yankuna.Saddam Hussein da shugabancinsa sun ɓuya, kuma a ranar 1 ga Mayu, Bush ya ba da sanarwar kawo ƙarshen manyan ayyukan yaƙi, inda ya koma lokacin mamayar sojoji.