Type "UB I" submarine (dzimwe nguva inozivikanwa se "UB-1" kirasi") yaive kirasi yemabhoti madiki emumhenderekedzo yegungwa (U-boats) akavakwa kuGerman pakutanga kweHondo Yenyika Yekutanga. Ngarava 20 dzakavakwa, zhinji dzadzo dzakapinda mubasa neGerman Imperial Navy. Mabhoti echirongwa ichi aishandiswawo neAustria-Hungary Navy (Kaiserliche und Königliche Kriegsmarine "kana" K.u.K. Kriegsmarine) uye Bulgarian Navy
. Muuto rehondo reAustria neHungary, rainzi 'the'.