The Church of L'Assumpció in Pego is the most important Catholic temple in the town. It is built in a Gothic Renaissance style and was constructed in the 16th century on the ruins of a smaller church, which, in turn, was built on the remains of the Uxola Mosque.

Construction of the new temple began in 1599 and was initially considered completed in 1614. However, the final touches were actually finished at the end of the century. The bell tower and the communion chapel were built between 1700 and 1725. The church preserves highly interesting works of art, including a 14th-century Veronica, a Mare de Déu de L'Esperança [Virgin of Hope], a processional cross from the 15th century, and other sculptures and goldsmithing objects.

At some point in its history, the Church of Pego had up to 16 beneficiaries. This parish gives its name to the archpriesthood and has historically been the centre of the valley known as La Vall de Pego and neighbouring towns and valleys. It preserves artistically significant pieces of regional and national interest, including 18th-century paintings and numerous goldsmithing works from the 15th century to the present. It also has 16th-century ceramic pieces and stuccos in the Chapel of the Blessed Sacrament, which is from the 18th century. Two exceptional works in the Valencian Gothic style stand out, attributed to a disciple of Reixach: the altarpiece of La Mare de Déu de L’Esperança or the “O“ and a double Veronica of La Santa Faç.

The current altarpiece of the main altar, as well as the paintings throughout the church, were created by the Valencian artist Rafael Cardells after the Spanish Civil War, painted between 1949 and 1963.

The bell tower of this church known locally as Església de L'Assumpció de Pego is made of cut stone and, due to its great height, the walls at the base are two metres thick. Construction of the bell tower began in 1700, and the different levels had to be covered with soil in order to raise it. This was the result of the work of Félix Pérez and the architect Francisco Galtea.

It houses the oldest parish archive in the region and is one of the best-preserved in the entire Valencian Community. The archive has volumes and documentation dating back to 1535.