Sants-Montjuïc is one of the ten districts of Barcelona, located in the Catalonia region of Spain. It is designated as District 3 and was formed in 1984 by merging two former districts, II and VII, along with various areas from the Zona Franca.
The district covers the southern part of the city and borders Les Corts, Eixample, and Ciutat Vella, as well as the neighboring municipalities of L'Hospitalet de Llobregat and El Prat de Llobregat. As of the 2005 census, the population of Sants-Montjuïc was 177,636.