| Lake Keretā | |
| Location: | Auckland Region, North Island, New Zealand |
| Inflow: | None |
| Pushpin Map: | New Zealand Auckland |
| Pushpin Map Alt: | Location of Lake Keretā |
| Outflow: | None |
| Basin Countries: | New Zealand |
| Area: | 32ha |
Lake Keretā lies at the South Head peninsula of the Kaipara Harbour, in the Rodney District, along the west coast of the North Island of New Zealand. The surface area of the lake is about with a maximum depth of and water temperature of about .
The lake is shallow and less than wide, stretching slightly more than 1km (01miles) in a north-westerly direction; there are no streams or rivers flowing into or out of it. It is primarily filled by underground water, and losses are due to evaporation from the surface of the lake.[1]