Duga can refer to:
- Duga (genus), genus of moths
- Duga-3, Soviet radar system deployed 1976-1989
- Duga-1 and Duga-2, prototypes of Duga-3
- Duga (magazine), Yugoslav and Serbian weekly newsmagazine
- Shaft bow, element of horse harness to attach to vehicle shaft
- Duga Island, island in Adriatic Sea, belonging to Croatia
- Duga Resa, municipality in Karlovac County, Croatia
- Duga, Podgorica, town in Podgorica Municipality, Montenegro
- Duga, Nikšić, town in Nikšić Municipality, Montenegro
- Duga, Štimlje, town in Štimlje municipality, Kosovo
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