Nagar River can refer to:
Bangladesh
- Nagar River (Rajshahi) begins in Bogra District and joins the Atrai River in Natore District
- Nagar River (Rangpur) crosses the border from India in Panchagarh district, flows south and east and crosses the border again in Thakurgaon District.
India
- Nagar River in Uttar Dinajpur district of West Bengal
Pakistan
- The Nagar River of Gilgit–Baltistan flows from the Khunjerab River, and is later known as the Hunza River.