Henry Lindlahr (March 1, 1862 – March 26, 1924) was the author of one of the cornerstone texts of American naturopathic medicine, Nature Cure, which includes topics about disease suppression versus elimination, hydrotherapy, and the importance of fresh air and sun bathing.

[6][7] Lindlahr and his institute were criticized by medical health experts for peddling quackery.

[4][8][9] For example, Lindlahr was an advocate of "Iridiagnosis", a method alleged to diagnosis any disease by examining the eye alone.

He also claimed that vaccination was worthless against smallpox and was the cause of cancer, tuberculosis and insanity.

These included dubious treatments such as chiropractic, homeopathy, osteopathy and "strange" diets.