| Logar River | |
| Pushpin Map: | Afghanistan |
| Pushpin Map Caption: | Place of Joining with Kabul River |
| Subdivision Type1: | Country |
| Subdivision Name1: | Afghanistan |
| Subdivision Type5: | Cities |
| Subdivision Name5: | Maidan Shahr, Puli Alam, Kabul |
| Length: | 64km (40miles) |
| Source1: | Baba Mountain |
| Source1 Coordinates: | 34.45°N 68.44°W |
| Source1 Elevation: | 2400m (7,900feet) |
| Mouth: | Kabul River |
| Mouth Location: | Kabul |
| Basin Size: | 1216km2 |
| Tributaries Left: | Ghazni River |
The Logar River (also Lowgar) is a river of Afghanistan. It gives the name to the Logar Valley and Logar Province. In Maidan Wardak Province where the river originates, it is called Chak River. The Chaki Wardak Dam is built on the river in Chaki Wardak District, Maidan Wardak Province.
The Logar River drains a wide tract of country, rising in Maidan Wardak Province in the southern slopes of the Sanglakh Range and receiving tributaries from hills in the Kharwar District, north-east of Ghazni. It joins the Kabul River a few kilometres below the city of Kabul. The fertile and well irrigated Logar Valley, which is watered by its southern tributaries, is about 64km (40miles) long by 19km (12miles) wide. Lying in the vicinity of the capital, the district contributes significantly to its food supply.