| Hamju County | |
| Native Name Lang: | ko |
| Settlement Type: | County |
| Translit Lang1: | Korean |
| Translit Lang1 Type: | Chosŏn'gŭl |
| Translit Lang1 Info: | 함주군 |
| Translit Lang1 Type1: | Hancha |
| Translit Lang1 Info2: | Hamju kun |
| Translit Lang1 Info3: | Hamju-gun |
| Subdivision Type: | Country |
| Subdivision Name: | North Korea |
| Subdivision Type1: | Province |
| Subdivision Name1: | South Hamgyong Province |
| Area Total Km2: | 693 |
| Population As Of: | 2008[1] |
| Population Total: | 133,896 |
| Population Density Km2: | auto |
| Parts Type: | Administrative divisions |
| Parts: | 1 ŭp, 36 ri |
Hamju County is a county in South Hamgyong province, North Korea.
The county's highest point is Norabong. The chief river is the Sangch'ŏn River (상천강). Aside from the coastal area, Hamju is mountainous throughout. It is cold, but is distinguished by the occurrence of foehn winds in the upland areas. Due to this, the climate is milder than the Yellow Sea coastal regions.
Hamju county is divided into 1 ŭp (town) and 36 ri (villages):
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In the level regions, a large amount of rice is produced. Most agriculture in the county is dry-field farming, with crops including Deccan millet, red beans, soybeans, potatoes, and vegetables. Silkworms and livestock are also widely raised, and fishing is carried out along the coast.
Mining also takes place, with deposits of iron ore, cuprite, and other minerals.
Hamju county is served by the P'yŏngra and Kŭmgol lines of the Korean State Railway, and by various roads.