| Selenge aimag | |
| Native Name: | Сэлэнгэ аймаг |
| Native Name Lang: | mn |
| Settlement Type: | Province |
| Flag Border: | no |
| Coordinates: | 49.75°N 136°W |
| Subdivision Type: | Country |
| Subdivision Name: | Mongolia |
| Established Title: | Established |
| Seat Type: | Capital |
| Seat: | Sükhbaatar |
| Leader Name: | gjha |
| Unit Pref: | Metric |
| Area Total Km2: | 41152.63 |
| Population Total: | 108768 |
| Population As Of: | 2017 |
| Population Density Km2: | auto |
| Demographics Type2: | GDP |
| Demographics2 Footnotes: | [1] |
| Demographics2 Title1: | Total |
| Demographics2 Info1: | MNT 10,024 billion US$ 0.3 billion (2022) |
| Demographics2 Title2: | Per capita |
| Demographics2 Info2: | MNT 21,692,300 US$ 3,026 (2022) |
| Timezone1: | UTC+8 |
| Postal Code Type: | as |
| Area Code: | +976 (0)136 |
| Registration Plate: | СЭ_ |
| Iso Code: | MN-049 |
Selenge (mn|Сэлэнгэ) is one of the 21 aimags (provinces) of Mongolia, located in the north of the country. The name is derived from the Selenge river. The capital is Sükhbaatar.
The province of Darkhan-Uul, and its capital Darkhan, is located as an enclave inside Selenge.
| Sum | Selenge | Population (2000) | Population (2002) | Population (2004) | Population (2006) | Population (2008) | Area (km2)[3] | Density (/km2) |
|---|---|---|---|---|---|---|---|---|
| Mongolian: Алтанбулаг | 3,489 | 4,003 | 3,783 | 4,255 | 4,545 | 2100.30 | 2.16 | |
| Baruunbüren | Mongolian: Баруунбүрэн | 3,999 | 2,430 | 2,430 | 2,378 | 2,702 | 2814.54 | 0.96 |
| Mongolian: Баянгол | 5,391 | 5,015 | 4,264 | 4,512 | 5,028 | 1976.28 | 2.54 | |
| Mongolian: Жавхлант | 1,767 | 1,921 | 1,838 | 1,704 | 1,827 | 1189.70 | 1.54 | |
| Khüder | Mongolian: Хүдэр | 1,799 | 1,772 | 1,838 | 1,936 | 2,078 | 2838.65 | 0.73 |
| Khushaat | Mongolian: Хушаат | 1,406 | 1,679 | 1,946 | 1,654 | 1,585 | 2010.15 | 0.79 |
| Mandal | Mongolian: Мандал | 23,964 | 22,645 | 22,864 | 22,975 | 23,646 | 4843.73 | 4.88 |
| Orkhon | Mongolian: Орхон | 2,817 | 2,467 | 2,106 | 2,006 | 2,165 | 1306.27 | 1.66 |
| Orkhontuul | Mongolian: Орхонтуул | 3,760 | 4,016 | 3,398 | 3,248 | 2,952 | 2940.83 | 1.00 |
| Sant | Mongolian: Сант | 2,062 | 2,050 | 2,033 | 2,054 | 2,056 | 1387.06 | 1.48 |
| Mongolian: Сайхан | 8,737 | 8,795 | 8,282 | 8,100 | 8,285 | 1311.87 | 6.32 | |
| Mongolian: Шаамар | 4,809 | 4,157 | 3,783 | 3,944 | 4,158 | 671.91 | 6.19 | |
| Sükhbaatar | Mongolian: Сүхбаатар | 22,374 | 21,076 | 20,025 | 19,916 | 19,626 | 45.35 | 432.77 |
| Mongolian: Цагааннуур | 4,153 | 4,221 | 3,919 | 4,005 | 4,257 | 3814.72 | 1.12 | |
| Tüshig | Mongolian: Түшиг | 1,899 | 1,725 | 1,608 | 1,552 | 1,420 | 2492.82 | 0.57 |
| Yeröö | Mongolian: Ерөө | 6,077 | 5,677 | 5,531 | 5,630 | 5,792 | 8203.51 | 0.71 |
| Züünbüren | Mongolian: Зүүнбүрэн | 2,507 | 2,226 | 2,373 | 2,201 | 2,468 | 1204.94 | 2.05 |
| Mongolian: Зүүнхараа | - | - | - | - | - | - | - | |