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This is a list of notable rivers of Mongolia. They are arranged geographically by river basin.

1. Orkhon River - 1,124 kilometres (698 mi)
2. Kherlen River - 1,090 kilometres (677 mi)
3. Tuul River - 704 kilometres (437 mi)
4. Zavkhan River - 670 kilometres (416 mi)
5. Selenge River - 593 kilometres (368 mi)
6. Tes River - 568 kilometres (353 mi)
7. Hovd River - 516 kilometres (321 mi)
8. Eg River - 475 kilometres (295 mi)
9. Ider River - 452 kilometres (281 mi)
10. Delgermörön - 445 kilometres (277 mi)

• Yenisei River (Russia)
  • Angara River (Russia), flowing out of Lake Baikal
    • Selenge River (Сэлэнгэ мөрөн in Sükhbaatar) flowing into Lake Baikal
      • Chikoy River
        • Menza River
        • Katantsa River
      • Jida or Dzhida River (Russia)
        • Zhelter River (Зэлтэр гол)
      • Orkhon River (Орхон гол in Kharkhorin, Bulgan)
        • Tuul River (Туул гол in Ulaanbaatar)
        • Tamir River (Тамир гол at Arkhangai)
        • Kharaa River (Хараа гол at Selenge)
      • Eg River (in Khatgal)
        • Üür River (at Khövsgöl)
          • Uilgan River (at Khövsgöl)
          • Arigiin River
        • Tarvagatai River
      • Khanui River ( at Arkhangai)
      • Ider River (Идэр гол at Khövsgöl)
        • Chuluut River (at Arkhangai)
          • Suman River (at Arkhangai)
      • Delgermörön River (Дэлгэрмөрөн in Mörön)
        • Beltes River
        • Bügsiin River
  • Lesser Yenisei (Russia)
    • Kyzyl-Khem (Кызыл-Хем)
      • Büsein River
      • Shishged River (Шишгэд гол)
        • Sharga River
        • Tengis River
          • River

• Amur River (Russia/China)
  • Shilka River (Russia)
    • Onon River (Онон гол)

• Kherlen River (Хэрлэн гол)

• Ongi River

• Khovd River

Rivers draining into endorheic Uvs Lake, forming the drainage of the Uvs Lake Basin

• Kharkhiraa River
• Sangil gol
• Turuun River
• Nariin gol
• Tes River
  • Shavar River
  • Tsereg River
  • Khachig River
  • Erzin River

• Zavkhan River

• Teeliin gol, flowing out of Khar Lake
  • Chono Kharaikh gol, draining into Khar Lake

• Bulgan River (Ulungur River)