| Lake Elmo State Park | |
| Map: | USA Montana |
| Relief: | 1 |
| Location: | Billings, Montana, U.S. |
| Coordinates: | 45.8411°N -108.4803°W |
| Area Acre: | 123 |
| Elevation: | 3199feet |
| Designation: | Montana state park |
| Established: | 1983 |
| Visitation Num: | 165,041 |
| Visitation Year: | 2023 |
| Administrator: | Montana Fish, Wildlife & Parks |
| Website: | Lake Elmo State Park |
Lake Elmo State Park is a public recreation area located on the northeast side of Billings, Montana. The state park occupies and is at an elevation of 3199feet. It offers swimming and non-motorized boating on a 64acres reservoir, three beach-front areas, fishing pier, grassed multi-use areas, two group-use shelters, playground, and fenced-in dog park on the lake's west side. The reservoir is primarily fed by the Billings Bench Water Association Canal.