The Type UB I was a class of small coastal submarines (U-boats) built in Germany at the beginning of the first World War. A total of twenty boats were built, the majority of which were in the service of the German Imperial Navy. Boats of the design were also operated by the Austro-Hungarian Navy and the Bulgarian Navy. The group is sometimes known as the UB-1 class after SM UB-1, the class leader. In the Austro-Hungarian Navy, it was called the U-10 class.

Built to fulfill a need for small, maneuverable submarines able to operate in the narrow, shallow seas off Flanders, the submarines were intended to be quickly constructed, then shipped by railroad and assembled at their port of operation. The design effort began in mid-August 1914 and by mid-October the first fifteen boats were ordered from two German shipyards. The German Imperial Navy ordered an additional pair later to replace two boats sold to Austria-Hungary, which ordered a further three in April 1915. The total number of UB I boats constructed was twenty.

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