The San Diego-Alcalá de Henares Sister City Society is a nonprofit organization that promotes cultural and educational exchanges between San Diego, California, and Alcalá de Henares, a city in the Madrid metropolitan area of Spain.

The society was established in 1982, and since then, it has worked to strengthen the relationship between the two cities through a variety of programs and events. These include student and teacher exchanges, cultural events and performances, language classes, and other educational and social activities.

One of the main goals of the San Diego-Alcalá de Henares Sister City Society is to foster mutual understanding and appreciation between the people of San Diego and Alcalá de Henares. Through cultural exchanges, members of both communities have the opportunity to learn about each other’s history, customs, and way of life, and to develop lasting friendships.