The Hansa-Brandenburg B.I was an unarmed military trainer and reconnaissance biplane of World War I, flown by the Austro-Hungarian Air Service.

This aircraft was one of the earliest designs of Ernst Heinkel, who was working for Hansa-Brandenburg at the time.

It was an entirely conventional two-bay biplane with staggered wings of unequal span.

The pilot and observer sat in tandem in a long open cockpit.

both variants shared the military designation B.I Only a single Hansa-Brandenburg B.I has survived World War One, it is located in the Budapest Aviation Museum in Hungary.