Lake Hiawatha is an unincorporated community and census-designated place (CDP)[5] located within Parsippany–Troy Hills Township in Morris County, in the U.S. state of New Jersey.

Lake Hiawatha is part of the Lenapehoking, the traditional territory of the Munsee subtribe of the Lenape tribe.

[9] The estate's owners included William Kelly, Abraham Lott, and Lucas Von Beverhoudt.

The biography served as inspiration for author Harriet Beecher Stowe as she wrote her 1852 anti-slavery novel Uncle Tom's Cabin.

[13] During the Revolutionary War from 1775 to 1783, Beverwyck Road was known as "Washington's Trail",[7] and was often traversed by French and Continental armies en route to Morristown.

[8] Visitors entertained at the Beverwyck plantation include George Washington, Nathaniel Greene, and the Marquis de Lafayette.

The lake was meant as the center of summer activity, consisting of an artificial beach with white sand, a pavilion, a playground, and an area for barbecues.

[15] An audience of 414 attended the show; donations and ticket sales provided enough money for the purchase of the first fire engine.

[14] In 1948, Benjamin J. Kline donated the funds required to create the Lake Hiawatha Public Library.

Then around 450 million years ago, a small continent collided with proto North America and created folding and faulting in western New Jersey and the southern Appalachians.

It is bordered to the south by the Parsippany CDP and to the northeast by Montville Township, including part of the community of Pine Brook.

The Census' American Community Survey estimated 4,158 households, and 2,540 families in Lake Hiawatha as of the period 2018-2022.

During that time period, the racial makeup of the community was an estimated 51.6% white, 3.8% black or African-American, 0.3% Native American, 32.9% Asian, 0% Pacific Islander, and 9.6% from two or more races.