Sanatorium Książę Józef, Medical sanatorium in Nałęczów, Poland.

Sanatorium Książę Józef is a health facility in Nałęczów offering accommodation across multiple floors with medical services and rehabilitation programs. The building contains rooms of different types and sizes to serve various guest needs, each with standard conveniences for comfort during treatment.

Built in 1878 by architect Karol Kozłowski for Fortunat Nowicki, the building became part of Nałęczów's expanding network of health facilities. Its construction reflected the architectural advances of the era and reinforced the town's growing reputation as a medical destination.

The sanatorium is named after Prince Józef Poniatowski, the Polish commander who drowned in the Elster River in 1813. Its location in Zdrojowy Park places it among the spa gardens that shaped Nałęczów's identity as a health resort. The building has been listed on the Polish cultural heritage register since 1967.

The sanatorium occupies a site in Zdrojowy Park and has 127 beds for spa stays. Treatments focus on cardiology, so guests are booked for cardiac rehabilitation rather than general wellness. The building is listed in the heritage register, which limits alterations to its structure.

The building was entered in the Polish register of monuments in 1967, the same year it was formally recognised as a heritage object. Today it holds 127 sanatorium places and specialises in cardiological treatment, so the historic pavilion in Zdrojowy Park still serves patients rather than visitors.