| Samsu County | |
| Native Name Lang: | ko |
| Settlement Type: | County |
| Translit Lang1 Type: | Chosŏn'gŭl |
| Translit Lang1 Info: | 삼수군 |
| Translit Lang1: | Korean |
| Translit Lang1 Type1: | Hancha |
| Translit Lang1 Info2: | Samsu-gun |
| Translit Lang1 Info3: | Samsu-gun |
| Mapsize: | 270px |
| Subdivision Type: | Country |
| Subdivision Name: | North Korea |
| Subdivision Type1: | Province |
| Subdivision Name1: | Ryanggang |
| Area Total Km2: | 874 |
| Population As Of: | 2008 |
| Population Total: | 40,311 |
| Population Density Km2: | auto |
| Parts Type: | Administrative divisions |
| Parts: | 1 ŭp, 1 workers' district, 23 ri |
Samsu County is a kun, or county, in Ryanggang province, North Korea. Prior to 1954, it was part of South Hamgyŏng province.
On its northern border, Samsu shares the Yalu River with China. It also shares a border with the province of North P'yŏngan. To the south, it occupies the northern tip of the Kaema Plateau. The southern and western reaches of Samsu abound with mountains. Due to the rugged terrain, transportation is difficult.
The highest peak of Samsu is Turungbong (두릉봉, 1921 m). The chief streams are the Changjin, Chungp'yŏng and Yalu rivers (this is probably the reason for its name, 삼수(三水), which literally means 'three rivers'). Due to its high inland location, Samsu enjoys bitterly cold winters.
Samsu county is divided into 1 ŭp (town), 1 rodongjagu (workers' district) and 23 ri (villages):
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The chief industries in Samsu are logging and farming. Despite the rugged terrain, rice cultivation is widespread; in addition, slash-and-burn agriculture is practiced in the high fields. Local crops include potatoes, maize, soybeans, oats and rye. The Yalu is used to ship rough logs downstream. There are also local deposits of gold ore.
The Pukbunaeryuk Line of the Korean State Railway serves the county, as do various conventional roads. There are multiple roads going out to Kanggye and Hyesan, but all have checkpoints.