The Cathedral of the Assumption of Mary, also known as the "Royal and Renowned Basilica Cathedral of the Assumption of the Blessed Virgin Mary" (Spanish: Real e Insigne Basílica de la Asunción de la Bienaventurada Virgen María), is a significantly important and historic landmark in León, Nicaragua.

The cathedral was awarded World Heritage Site status with the United Nations Educational, Scientific and Cultural Organization (UNESCO).

Beneath the cathedral, in crypts designed to survive earthquakes, the mortal remains of 27 people rest, among them 10 bishops, 5 priests, an eminent leader of the independence movement, three poets, a musician, six notables and a slave.

The tomb of Darío, father of the Modernist movement in Spanish-language literature and considered Prince of Castilian letters, is to the foot of the statue of San Pablo.

Navas also sculpted the Neoclassical statues of the Twelve Apostles next to the columns of the central nave, the lion of Dario's tomb, very similar to the Lion of Lucerne, Switzerland (carved by the Danish sculptor Bertel Thorvaldsen, 1770–1844), the sculpture of Christ marking Monsignor Pereira's tomb, and several other decorations inside the Cathedral and its Chapel of the Sacrarium.

[5] In its statement, UNESCO described the Nicaraguan architectural sight as follows: The cathedral of León in Nicaragua was built between 1747 and the beginning of the 19th century with designs by the Guatemalan architect Diego José de Porres Esquivel.

The cathedral has in its interior important works of art, including a Flemish altar and paintings of the 14 stations of the Via Crucis by the Nicaraguan artist Antonio Sarria.