Lake Purdy
General data
- Name: Lake Purdy
- Water system: Mobile River
- Water type: Artificial lake
- Progression: Little Cahaba River -> Cahaba River -> Alabama River -> Mobile River -> Mobile Bay -> Gulf of Mexico -> Atlantic Ocean -> Planet Earth
- Climates: Temperate
- Continents: North America
- Countries: United States of America
Lake Purdy (Alabama, USA) is a reservoir in northern Shelby County created by damming the Little Cahaba River; it serves as a major drinking-water source for the Birmingham area.