Yaƙe-yaƙe na Bulgaria -Serbiya na 917-924 jerin rikice-rikice ne da aka yi tsakanin Masarautar Bulgeriya da Masarautar Serbia a matsayin wani ɓangare na babban yaƙin Byzantine-Bulgaria na 913-927.Bayan da 'yan Bulgaria suka hallaka sojojin Rumawa a yakin Achelous, diflomasiyyar Byzantine ta tunzura masarautar Serbia don kai wa Bulgaria hari daga yamma.Bulgeriya sun magance wannan barazanar kuma sun maye gurbin yariman Serbia da wani mai kare kansu.A cikin shekaru masu zuwa, daulolin biyu sun yi takara don samun iko akan Serbia.A cikin 924 Sabiyawan sun sake tashi, sun yi kwanton bauna kuma suka ci wani karamin sojojin Bulgaria.Wannan juye-juye ya haifar da wani babban kamfen na ramuwar gayya wanda ya ƙare tare da mamaye ƙasar Serbia a ƙarshen wannan shekarar.Ci gaban Bulgaria a Yammacin Balkans 'yan Croat ne suka bincikar da suka ci sojojin Bulgaria a 926.