Lake Poinsett is a Lake in Hamlin, South Dakota.

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Lake Poinsett is a one of South Dakota’s largest natural lakes with a surface area of nearly 8,000 acres. There are two potential major sources of surface water that may flow into Lake Poinsett. Lake Poinsett is part of a watershed with water flowing into the lake from the west where lakes Albert, John, Mary, Norden, Marsh, Thisted, and Badger are located. The drainage into Lake Poinsett from the west covers a vast area including the western half of Hamlin County, the northeast portion of Kingsbury County, the eastern portion of Clark County, and the southwest portion of Codington County. In the late nineteenth century it was proposed that the Big Sioux River floodwater be stored in Lake Poinsett and a diversion channel was created connecting Lake Poinsett to the Big Sioux River. Thus, during flood events the Big Sioux River watershed north of Lake Poinsett can be a source of surface water.

Historically, Lake Poinsett has been a popular destination for recreational activities including fishing, boating, swimming, water-skiing, and camping.