St. Mark's Cathedral, Roman Catholic cathedral in Arica, Chile

St. Mark's Cathedral is a place of worship in Arica built entirely from cast and wrought iron. The structure displays Gothic features with stamped and molded metal throughout, painted carefully to protect the material.

After the devastating earthquake of 1868 destroyed the original church, President José Balta ordered construction of a new cathedral. The building was inaugurated in 1876, marking the region's religious recovery.

The cathedral's patron, Saint Mark, is celebrated every 25 April, the date of the Spanish founding of the city. A bell displayed inside the church was declared a Historic Monument on 5 August 2002. Until the early 20th century the parish still belonged to the Peruvian diocese of Arequipa.

The building opens for visitors during set times that align with worship services. Access for those with mobility challenges exists through designated entry points, though options are limited.

The iron structure was ordered by Peruvian President José Balta for the seaside resort of Ancón, not for Arica. A committee of Arica women asked Balta to redirect it to their city after the 1868 earthquake destroyed the old church, and the metal parts arrived at the port in 1875, assembled by French technicians. The Eiffel attribution is often repeated but has no support in local or French archives.