Lake Harmony is an unincorporated community in Kidder Township, Carbon County, Pennsylvania, United States.

In 1913, Frederick Charles Brenckman wrote: The region about Lake Harmony has in recent years become quite popular as a summer resort.

Numerous cottages or bungalows have been erected, principally by people from Mauch Chunk and Allentown, while many, lured by the cool breezes and quietness of the retreat, spend a portion of the heated term of each year as campers on the shores of the lake.

[1]The Split Rock Lodge at Lake Harmony was originally a private retreat for the executives of the Lehigh Coal and Navigation Company, but much of the land was sold to developers.

Bel Air Collections promised numerous renovations throughout the resort, from room redesigns to refurbished fitness areas to bar and restaurant amenities.

[4] Lawsuits in 2023 suggest that progress in some areas of renovations have ground to a halt or even regressed, with timeshare owners alleging false advertising practices by Bel Air.