| Allen Lake | |
| Other Name: | French: lac Allen |
| Location: | Haliburton County, Ontario |
| Type: | lake |
| Part Of: | Ottawa River drainage basin |
| Inflow: | Allen Creek |
| Outflow: | Allen Creek |
| Basin Countries: | Canada |
| Area: | 96.96ha |
| Elevation: | [1] |
| Pushpin Map: | Canada Southern Ontario |
| Pushpin Map Alt: | Map of Southern Ontario with location of Allen Lake shown with a dot |
| Pushpin Map Caption: | Location in Southern Ontario |
Allen Lake (fr|lac Allen) is a lake in the municipality of Dysart et al, Haliburton County in Central Ontario, Canada.[2] [3] [4] [5] It is on Allen Creek and is in the Ottawa River drainage basin.
Allen Lake has an area of 96.96ha and lies at an elevation of . It is long and wide. The lake is at the height of land between the Ottawa River drainage basin to the north and east, and the Trent River drainage basin to the west and southwest. The nearest named community is Pusey, to the south just over the border into the neighbouring municipality of Highlands East.
The primary inflow is Allen Creek, arriving at the south from the direction of Little Allen Lake. There is one unnamed secondary inflow in the southwest. The primary outflow, at the northern end of the lake, is also Allen Creek, which flows via Benoir Lake, the York River and the Madawaska River to the Ottawa River.