U-4
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U-4 may refer to:
- Unterseeboot 4 is the designation of several German U-boats, active during World War I, World War II and the post war period.
- U-4 Aero Commander, a light twin-engined aircraft by Aero Design and Engineering Company part of Rockwell International used by USAF.
- U4, unemployment figure released by Bureau of Labor Statistics

