| Lake Öreg | |
| Location: | Tata, Hungary |
| Coords: | 47.64°N 18.3292°W |
| Inflow: | Által brook |
| Outflow: | Által brook |
| Basin Countries: | Hungary |
| Area: | 2.69km2 |
| Max-Depth: | 5m (16feet) |
| Elevation: | 129m (423feet) |
| Pushpin Map: | Hungary |
| Pushpin Map Alt: | Location of Lake Öreg in Hungary. |
Lake Öreg (meaning "old lake") (Hungarian: Öreg-tó) is a lake near Tata, Hungary.
The lake is situated in the middle of the town of Tata. Adjoining the South-east quarter of the lake is a wooded area. It is fed by the Által-brook (Hungarian: Által-ér) from the south-east, which then leaves it in a Northerly direction through the town until it eventually reaches the Danube.
On the lake's shores lie Tata Castle and the Esterházy Palace.