| Sumkar District | |
| Pushpin Map: | Papua New Guinea |
| Coordinates: | -4.652°N 145.977°W |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location within Papua New Guinea |
| Subdivision Type: | Country |
| Subdivision Name: | Papua New Guinea |
| Subdivision Type1: | Province |
| Subdivision Name1: | Madang Province |
| Seat Type: | Capital |
| Seat: | Karkar Island |
| Area Total Km2: | 2001 |
| Population Total: | 84944 |
| Population As Of: | 2011 census |
| Population Density Km2: | auto |
| Demographics1 Title1: | Main languages |
| Timezone1: | AEST |
| Utc Offset1: | +10 |
Sumkar District is a district in the north of Madang Province in Papua New Guinea. It is one of the six administrative districts that make up the province. Sumkar is a district which is made up of Karkar Island and part of mainland NCR.