Palacete de Eduardo Adcoch, Neoclassical mansion in Almagro, Madrid, Spain.

The Palacete de Eduardo Adcoch is a mansion at Paseo de la Castellana 37, designed by José López Sallaberry and built in 1905–1906. Its grey stone facade mixes Spanish neo-Renaissance elements with French-influenced details of the early 20th century, including miradores and balconies. It has three floors and a basement with a laundry and wine cellar, plus a tower with a mansard roof and a pinnacle-topped roof terrace.

The palace was designed in 1905 by José López Sallaberry and built from 1905 to 1906 as a residence for Madrid's aristocracy. Elena Pérez Sanjurjo, who received it by donation, lived there only occasionally until about 1984. After a disputed inheritance, Ferrovial bought it in 1999 and Rafael de La Hoz Castanys renovated it for the Rafael del Pino Foundation; in 2005 he added the glass-fronted Edificio Fortuny over the old garden, opened in 2008.

The building was designed as a hotel for Madrid's aristocracy moving to the new ensanche, a sign of economic and social power. Its name comes from Eduardo Adcoch, though the owner who donated it was Elena Pérez Sanjurjo, who lived mostly in Switzerland and had patronised yachts in her youth. She left it to her domestic employee Isabel, who lived there for some years.

The mansion is located on Paseo de la Castellana in the Almagro neighborhood and now serves as the headquarters of the Rafael del Pino Foundation, which regularly hosts exhibitions and cultural events. Visitors should check in advance for public events since the building is not always open for general visits.

The original owner Elena Perez Sanjurjo was an adventurer who spent many years living in Switzerland and sailed yachts in her youth. After her death, she left the mansion to her longtime household employee Isabel, an unusual decision for that era.