Lake Elmo State Park is a public recreation area located on the northeast side of Billings, Montana.

The state park occupies 123 acres (50 ha) and is at an elevation of 3,199 feet (975 m).

[2] It offers swimming and non-motorized boating on a 64-acre (26 ha) 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.

[2] The reservoir is primarily fed by the Billings Bench Water Association Canal.

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