Santillana del Mar is a municipality and a population of the autonomous community of Cantabria (Spain). It is located on the west coast of Cantabria, in the north of Spain, which is its extreme east.

The village was declared a historical-artistic complex in 1889. In its immediate vicinity is the Altamira cave, protected as a World Heritage Site. It is one of the most visited and most visited towns in the North of Spain, being an essential stop for tourists who visit the region. This has made a large part of the inhabitants of the municipality live from the tourist activity, especially the hospitality, rural accommodation and shops of typical products.

Since July 2013, Santillana del Mar is part of the network The most beautiful villages in Spain.