German submarine U-146
U-146 may refer to one of the following German submarines:

 , a Type U 142 submarine laid down during the First World War but unfinished at the end of the war; broken up incomplete 1919–20
 During the First World War, Germany also had this submarine with a similar name:
 , a Type UB III submarine launched in 1918 and but unfinished at the end of the war; broken up incomplete in 1919
 , a Type IID submarine that served in the Second World War until scuttled 2 May 1945; wreck broken up at later date

Submarines of Germany