Haslett is a census-designated place (CDP) in Ingham County in the U.S. state of Michigan.

By the later 1800s, thousands of spiritualists descended on Haslett Park for summer meetings, readings, lectures, and seances.

Mr. Haslett had hoped to establish his camp as the National Headquarters for the spiritualist movement.

His untimely death in 1891 and the decline of the spiritualist movement caused his widow to sell the land to the Haslett Park Association in 1898.

The new owners transformed the land into a summer recreational destination, and eventually, a figure-8 wooden roller coaster and other carnival rides were added, thus establishing what became known as Lake Lansing Amusement Park.

[4] Haslett is in northern Ingham County and is bordered by the city of East Lansing to the west and the unincorporated community of Okemos to the south.

Business Loop I-69 (East Saginaw Street) runs through the northwest part of Haslett, leading northeast to Interstate 69 in Clinton County and west into Lansing.

The lake is 461 acres (1.87 km2) in size and features two public parks, allowing access to beaches, fishing, and a boat launch.