U-3 may refer to one of the following German submarines:
- SM U-3 (Germany), lead ship of the Type U-3 class of submarines; launched in 1909 and served in the First World War as a training submarine; surrendered in 1918
- During the First World War, Germany also had these submarines with similar names:
- SM UB-3, a Type UB I submarine launched in 1915 and sunk on 23 May 1915
- SM UC-3, a Type UC I submarine launched in 1915 and sunk on 27 May 1916
- During the First World War, Germany also had these submarines with similar names:
- German submarine U-3 (1935), a Type IIA submarine that served in the Second World War and was scrapped in 1945
- German submarine U-3 (S182), a Type 201 submarine of the Bundesmarine that was launched in 1964; loaned out to Royal Norwegian Navy from 1964 to 1966; later broken up
U-3 or U-III may also refer to:
- SM U-3 (Austria-Hungary), lead boat of the U-3-class submarines for the Austro-Hungarian Navy
See also
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