Smithville Lake
General data
- Name: Smithville Lake
- Water system: Missouri River
- Water type: Artificial lake
- Progression: Little Platte River -> Platte River (Nebraska) -> Missouri River -> Mississippi River -> Gulf of Mexico -> Atlantic Ocean -> Planet Earth
- Climates: Continental
- Continents: North America
- Countries: United States of America
Smithville Lake is a 2,910 ha reservoir on the Little Platte branch of the Platte River in Clay County, Missouri near Smithville. It is the largest body of water in the Kansas City metropolitan area. The reservoir provides the water supply for Smithville, Missouri.