| Blackbeck Tarn | |
| Location: | Lake District, Cumbria |
| Coords: | 54.5042°N -3.2339°W |
| Type: | Tarn |
| Pushpin Map: | United Kingdom Lake District#United Kingdom Allerdale |
| Pushpin Map Caption: | Location in the Lake District National Park##Location in Allerdale, Cumbria |
| Basin Countries: | United Kingdom |
| Length: | 183m (600feet) |
| Width: | 80m (260feet) |
| Area: | 0.95ha |
| Max-Depth: | 2.5m (08.2feet) |
| Elevation: | 486m (1,594feet) |
Blackbeck Tarn is a small tarn in Cumbria, England, situated near the summit of Haystacks in the Buttermere Valley.[1] At an elevation of 486m (1,594feet), the lake has an area of 0.95ha and measures 183x, with a maximum depth of 2.5m (08.2feet).[2]