U 73
U73 stands for:
- HMAS Warrego (U73) , a Royal Australian Navy military ship
- the U73 line in the Düsseldorf light rail network; see list of Düsseldorf light rail lines
U 73 denotes:
- SM U 73 , a submarine of the German Imperial Navy during the First World War
- U 73 (Kriegsmarine) , a submarine of the German Wehrmacht in World War II
