| Flakstadelva | |
| Name Other: | Flagstadelva |
| Pushpin Map: | Innlandet#Norway |
| Pushpin Map Caption: | Location of the river |
| Subdivision Type1: | Country |
| Subdivision Name1: | Norway |
| Subdivision Type2: | County |
| Subdivision Name2: | Innlandet |
| Subdivision Type3: | Municipalities |
| Subdivision Name3: | Hamar Municipality |
| Length: | 32.6km (20.3miles) |
| Discharge1 Avg: | 1.96m3/s |
| Source1: | Lavsjømyrene |
| Source1 Location: | Løten, Norway |
| Source1 Coordinates: | 61.0059°N 11.2369°W |
| Mouth: | Lake Mjøsa |
| Mouth Location: | Hamar, Norway |
| Mouth Coordinates: | 60.7968°N 11.1037°W |
| Basin Size: | 179.88km2 |
Flakstadelva is a river in Innlandet county, Norway. The 32.6km (20.3miles) river begins in the Lavsjømyrene bog areas in northern Løten. From there it runs in a southerly direction and forms the lake Nybusjøen which discharges into the Lundsbekken river. The river flows in a v-shaped valley which twists before its mouth at the town of Hamar where it empties into the lake Mjøsa.[1] The river's erosion has exposed the lower Cambrian and middle Cambrian rock formations in that region.[2]