U 77
U77 stands for:
- HMAS Yarra (U77) , a Royal Australian Navy ship
- the U77 line on the Düsseldorf Stadtbahn network; see list of Düsseldorf light rail lines
U 77 denotes:
- SM U 77 , a submarine of the German Imperial Navy during the First World War
- U 77 (Kriegsmarine) , a submarine of the German Wehrmacht in World War II
