U-149 may refer to one of the following German submarines:

• {{SMU|U-149}}, a Type U 142 submarine launched during World War I 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:
  • {{SMU|UB-149}}, a Type UB III submarine launched in 1918; broken up in 1922
• {{GS|U-149|1940}}, a Type IID submarine that served in the Second World War; taken to Loch Ryan on 30 June 1945; sunk on 21 December 1945 as a part of Operation Deadlight

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