The Cathedral-Basilica of Our Lady of the Pillar is a Roman Catholic church located in Zaragoza, Spain. It is one of the most important Marian shrines in the world and is dedicated to Our Lady of the Pillar, the patron saint of Zaragoza. The church is said to house the original pillar that the Virgin Mary stood on when she appeared to Saint James the Greater in the 1st century.

The current Cathedral-Basilica was built in the 16th and 17th centuries and is known for its Baroque-style architecture. The interior of the church features elaborate decoration, including a number of frescoes and paintings. The church also houses several important religious artifacts, including a statue of the Virgin Mary and a 12th-century Romanesque cloister.

Visitors to the Cathedral-Basilica of Our Lady of the Pillar can explore the church and its grounds, including the cloister and the museum, which houses a collection of religious art and artifacts. The church is open to visitors year-round and is a popular tourist destination in Zaragoza.