Yaƙin Tannenberg, wanda aka yi yaƙi daga ranar 23 zuwa 30 ga Agusta, 1914, a farkon yakin duniya na ɗaya, babban nasara ce da Jamus ta yi da Rasha .Wannan yakin ya haifar da mummunar shan kashi na sojojin Rasha na biyu da kuma kashe kansa na kwamandan Janar Alexander Samsonov.Bugu da kari, haduwar ta haifar da asara mai tsanani ga Sojan Farko na Rasha a cikin fadace-fadacen tafkin Masurian na farko da suka biyo baya, wanda hakan ya kawo cikas ga kokarin sojojin Rasha a yankin har zuwa lokacin bazara na shekarar 1915.Yakin ya nuna tasirin dabarun da sojojin Jamus na takwas suka yi na amfani da hanyoyin jiragen kasa don saukaka saurin zirga-zirgar dakaru, wanda ke da matukar muhimmanci wajen shiga da kuma kayar da sojojin Rasha a jere.Da farko dai Jamusawan sun yi nasarar jinkirta sojojin na farko na Rasha, sannan suka tattara dakarunsu don kawas da rungumar Soji ta biyu, daga karshe kuma suka mayar da hankalinsu ga sojojin farko.Babban kuskure a cikin dabarun Rasha shine gazawarsu na ɓoye hanyoyin sadarwa na rediyo, maimakon watsa shirye-shiryen aiki a fili, wanda Jamusawa suka yi amfani da su don tabbatar da cewa ba su fuskanci wani abin mamaki ba a cikin motsin su.Nasarar da aka yi a Tannenberg ta taimaka matuka wajen inganta martabar Field Marshal Paul von Hindenburg da jami'in aikinsa Erich Ludendorff, wadanda dukkansu suka zama fitattun shugabannin sojoji a Jamus.Duk da yakin da ya faru a kusa da Allenstein (yanzu Olsztyn), an ba shi suna bayan Tannenberg mai tarihi, wurin da aka yi yaƙi a tsakiyar zamanai inda aka ci nasara da Teutonic Knights , a alamance yana danganta wannan nasara ta zamani tare da ɗaukar fansa na tarihi, don haka yana haɓaka tasirin tunaninsa da martabarsa.