| Official Name: | Nizhny Olshan |
| Native Name: | Нижний Ольшан |
| Native Name Lang: | ru |
| Settlement Type: | Selo |
| Pushpin Map: | Russia Voronezh Oblast#Russia |
| Subdivision Type: | Country |
| Subdivision Name: | Russia |
| Subdivision Type1: | Region |
| Subdivision Name1: | Voronezh Oblast |
| Subdivision Type2: | County |
| Subdivision Type3: | District |
| Subdivision Name3: | Ostrogozhsky District |
| Subdivision Type4: | Municipality |
| Utc Offset1: | +3:00 |
| Coordinates: | 50.75°N 93°W[1] |
Nizhny Olshan (Russian: links=no|Нижний Ольшан) is a rural locality (a selo) and the administrative center of Olshanskoye Rural Settlement, Ostrogozhsky District, Voronezh Oblast, Russia. The population was 884 as of 2010.[2] There are 12 streets.[3]
Nizhny Olshan is located 23 km southwest of Ostrogozhsk (the district's administrative centre) by road. Veretye is the nearest rural locality.[4]