Lake Killarney
General data
- Name: Lake Killarney
- Water system: Mississippi River
- Water type: Artificial lake
- Progression: St. Francis River (Mississippi tributary) -> Mississippi River -> Gulf of Mexico -> Atlantic Ocean -> Planet Earth
- Climates: Continental
- Continents: North America
- Countries: United States of America
Lake Killarney (Missouri) is a small reservoir in Iron County, Missouri. The lake drains through or over its dam into a local unnamed drainage channel that feeds into the local tributaries of larger drainage systems in Iron County (eventually contributing to larger nearby rivers such as the St. Francis River watershed.