Deerock Lake is a lake in the Moira River in Tweed, Hastings County and Addington Highlands, Lennox and Addington County in Ontario, Canada.

Only the southwest tip of the lake lies in Tweed, Hastings County.

There are also eight unnamed creek secondary inflows at the west, northwest, three at north including one from Twin Lakes, and three at the south, including one from Denis Lake.

Partridge Creek is also the primary outflow at the east end of the lake, controlled by the Deerock Dam.

As a result, availability is not assured as spots are on a first come basis especially during peak season.