The Hospital de Sant Pau is a complex of buildings in Barcelona, Spain, designed by the Catalan modernist architect Lluís Domènech i Montaner. The complex was built between 1902 and 1930, and was used as a hospital until 2009, when a new hospital building was constructed on the premises.

The Hospital de Sant Pau was built to be a pioneering medical facility, and its architecture reflects this purpose. The buildings are designed to be light and airy, with ample natural light and ventilation, which was seen as important for the recovery of patients. The complex includes a number of different buildings, arranged around a central courtyard. The buildings are decorated with intricate mosaics, sculptures, and other decorative elements.

One of the most striking features of the Hospital de Sant Pau is the extensive use of color. The buildings are decorated in a range of bright colors, which was intended to create a cheerful and welcoming environment for patients. The complex is also known for its extensive use of natural materials, including stone, tile, and wood.

Today, the Hospital de Sant Pau is a UNESCO World Heritage Site, and is open to the public for tours. The complex is also used for cultural events and exhibitions. Visitors can explore the various buildings and courtyards, and learn about the history of the hospital and its architecture.