Altamura Cathedral (Italian: Duomo di Altamura, Cattedrale di Santa Maria Assunta), dedicated to the Assumption of the Blessed Virgin Mary, is a Roman Catholic cathedral in the city of Altamura, in the Metropolitan City of Bari, Apulia, in southern Italy.

Since 1986 it has been the seat of the Bishop of Altamura-Gravina-Acquaviva delle Fonti, formed in that year. Previously it was the church of the territorial prelature of Altamura (from 1848, Altamura e Acquviva delle Fonti).

The church was built by will of emperor Frederick in 1232–1254. The main gate, the portal, the rose window were all on the opposite side that in today's construction, while the altar was located in the area where the main gate is now. In 1248, under pressure from Frederick, Pope Innocent IV declared Altamura exempt from the jurisdiction of the bishop of Bari, making it a "palatine" church, one of four in Apulia.^[1]

Historian Domenico Santoro (1688) hypothesized that the church may occupy the location of a Greek or Roman temple dedicated to Castor and Pollux,^[2] since on the capitols of the chorus two statues of Castor and Pollux were present at least until the 18th century, before being destroyed.^[3] Vitangelo Frizzale (1755), instead, states that it was a temple devoted to Janus (Latin: Ianus bifrons), a Roman deity. This would be confirmed by the presence, in the past, of a two-faced herm on the cusp of the cathedral's ancient façade.^[4] However, during the restoration works performed in the 2010s, this sculpture was instead identified as the head of a Saracen. The sculpture had an apotropaic purpose and it evoked the fears of an invasion of Saracens, which, especially in the 16th century, was a widespread fear among Mediterranean Europe Christians.^[5]

An inscription in Latin, located upon the so-called "Angevin door" (Italian: Porta Angioina), says that the church collapsed on January 29, 1316 and that it was rebuilt with the help of skilled constructors from the nearby Bitonto. The first man who correctly translated this inscription was local historian Ottavio Serena, as he stated in his unfinished work Storia di Altamura. Previous historians incorrectly translated the inscription (which was hard to read and written in bad Latin), assigning the inscription referred to a privilege that Altamura benefited, according to which every year Bitonto's mayor used to come to Altamura to take the price list of the foods and to spread it to the whole province.^[6]

The current orientation of the church is opposite to the original one, although it is not known if the change dates to Robert of Anjou's reign (early 14th century) or to the enlargement carried out in 1521–1547. The northern portal dates from Robert's time, while the second bell tower, the altar area and the sacristy were added in the 16th century. From the 18th century are the upper parts of the two bell towers and the small loggia between them. A chamber containing a clock (Altamuran dialect: casa dell'arlogio, Italian: casa dell'orologio) with weights and counterweights, was demolished in the first half of the 16th century and then it was built again, and its latter shape it appears an 18th-century painting of Saint Irene in the Council Hall of the city of Altamura.^[7] In the same painting, a thunder is shown hitting the tower of the cathedral; this refers to a real accident, which occurred in 1726. According to the sources, the thunder hit the cathedral twice, and it considerably damaged it. Over the following three years, restoration works were carried out and the towers were also extended. Domes were also added to each of the two towers (as shown in the previous paintings, the domes had not been built yet).^[8][9]

On the place where today is the clock tower, just above the seats, the cathedral also had a secondary rose window and other surrounding windows, which are now walled.^[10]

In 1729, the statues of the Assumption of Mary (Italian: Assunta) and of the two saints Peter and Paul were made and then added. In the following years, the clock chamber was turned into a Baroque loggia which is now visible between the two towers.^[11]

In 1858 (just three days before the Unification of Italy), the clock tower was added (designed by architect Corradino de Judicibus).^[12]

Altamura Cathedral has been restored in 2006^[13] The works have restored the external walls of the cathedral to their original white color.^[14] Another restoration work has been carried out in 2017 for the floor, the lighting system, the three entrance portals and other wooden structures.^[15]

• Commemorative plaque about Italian scientist Luca de Samuele Cagnazzi, located inside "Cappellone di San Giuseppe".^[18][19]