| Lake Ukiel | |
| Other Name: | Krzywe Lake |
| Location: | Olsztyn |
| Coords: | 53.7833°N 45°W |
| Pushpin Map: | Warmian-Masurian Voivodeship |
| Catchment: | 25.9km2 |
| Basin Countries: | Poland |
| Area: | 412ha |
| Depth: | 10.6m (34.8feet) |
| Max-Depth: | 43m (141feet) |
Lake Ukiel (or Krzywe Lake - informal name) is a lake in Poland which is located on Pojezierze Olsztyńskie, in the northwest part of Olsztyn, between district Dajtki, Gutkowo and Likusy.
Ukiel is the biggest lake in Olsztyn. There are pensions, hotels and a municipal beach.