The Adirondack Cottage Sanitarium was a tuberculosis sanatorium established in Saranac Lake, New York in 1885 by Dr. Edward Livingston Trudeau. After Trudeau's death in 1915, the institution's name was changed to the Trudeau Sanatorium, following changes in conventional usage. It was listed under the latter name on the National Register of Historic Places in 1995.

A sanatorium, also sanitarium or sanitorium, is a historic name for a specialised hospital for the treatment of specific diseases, related ailments and convalescence. Sanatoriums are often in a healthy climate, usually in the countryside. The idea of healing was an important reason for the historical wave of establishments of sanatoriums, especially at the end of the 19th- and early 20th centuries. One sought, for instance, the healing of consumptives especially tuberculosis or alcoholism, but also of more obscure addictions and longings of hysteria, masturbation, fatigue and emotional exhaustion. Facility operators were often charitable associations such as the Order of St. John and the newly founded social welfare insurance companies.