Jamhuriyar Weimar, wacce a hukumance ake kira Jamus Reich, ita ce gwamnatin Jamus daga 1918 zuwa 1933, lokacin da ta kasance jamhuriyar tarayya ta tsarin mulki a karon farko a tarihi;Don haka ana kiranta, kuma ana kiranta da kanta ba bisa ka'ida ba, a matsayin Jamhuriyar Jamus.Sunan da ba na yau da kullun na jihar ya samo asali ne daga birnin Weimar, wanda ya karbi bakuncin majalisar wakilai da ta kafa gwamnatinta.Bayan barnar yakin duniya na farko (1914-1918), Jamus ta gaji kuma ta kai karar zaman lafiya a cikin mawuyacin yanayi.Sanin shan kaye na gabatowa ya haifar da juyin juya hali, kawar da Kaiser Wilhelm II, mika wuya ga Allies, da shelar Jamhuriyar Weimar a ranar 9 ga Nuwamba 1918.A cikin shekarunta na farko, manyan matsaloli sun dabaibaye jamhuriyar, kamar hauhawar farashin kaya da tsattsauran ra'ayi na siyasa, gami da kashe-kashen siyasa da yunkurin kwace mulki sau biyu ta hanyar fada da 'yan ta'adda;a duniya, ta fuskanci keɓancewa, da rage matsayin diflomasiyya, da alaƙar jayayya da manyan ƙasashe.A shekara ta 1924, an dawo da kwanciyar hankali mai yawa na kuɗi da na siyasa, kuma jamhuriyar ta sami ci gaba a cikin shekaru biyar masu zuwa;Wannan lokacin, wanda wani lokaci ake kira Golden Twenties, yana da alaƙa da gagarumin bunƙasa al'adu, ci gaban zamantakewa, da inganta dangantakar kasashen waje a hankali.A karkashin yerjejeniyar Locarno na 1925, Jamus ta matsa zuwa daidaita dangantaka da maƙwabtanta, tare da sanin yawancin sauye-sauyen yankuna a ƙarƙashin yarjejeniyar Versailles kuma ta yi niyyar ba za ta taɓa yin yaƙi ba.A shekara mai zuwa, ta shiga cikin Ƙungiyar Ƙungiyoyin Ƙasashen Duniya, wanda ke nuna alamar sake komawa cikin al'ummomin duniya.Duk da haka, musamman a bangaren 'yan siyasa, an ci gaba da nuna kyama da kyamar wannan yarjejeniya da wadanda suka rattaba hannu kuma suka goyi bayanta.Babban Bala'in na Oktoba 1929 ya yi tasiri sosai ga ci gaban Jamus;yawan rashin aikin yi da tashe-tashen hankula na zamantakewa da siyasa da suka biyo baya suka haifar da rugujewar gwamnatin hadin gwiwa.Daga Maris 1930, Shugaba Paul von Hindenburg ya yi amfani da ikon gaggawa don marawa Chancellor Heinrich Brüning, Franz von Papen da Janar Kurt von Schleicher baya.Babban Bala'in, wanda manufar Brüning ya yi na deflation ya tsananta, ya haifar da karuwar rashin aikin yi.A ranar 30 ga Janairun 1933, Hindenburg ya nada Adolf Hitler a matsayin shugaban gwamnatin hadin gwiwa;Jam'iyyar Nazi ta dama ta Hitler ta mallaki kujerun majalisar ministoci biyu cikin goma.Von Papen, a matsayin mataimakin shugaban gwamnati kuma amintaccen Hindenburg, zai yi aiki don kiyaye Hitler a karkashin iko;waɗannan nufe-nufe sun yi mugun zagon kasa ga ikon siyasar Hitler.A ƙarshen Maris 1933, Dokar Wuta ta Reichstag da Dokar Taimakawa ta 1933 sun yi amfani da yanayin da ake gani na gaggawa don ba da iko ga sabon Chancellor yadda ya kamata don yin aiki a waje da ikon majalisa.Nan take Hitler ya yi amfani da wadannan madafun iko wajen dakile tsarin mulki da kuma dakatar da ‘yancin walwala, wanda ya kawo rugujewar dimokuradiyya a matakin tarayya da jihohi, da samar da mulkin kama-karya na jam’iyya daya a karkashin jagorancinsa.