Basilica di Santa Tecla, Early Christian basilica in Milan, Italy

Basilica di Santa Tecla was a five-aisled paleo-Christian basilica on the site of today's Piazza del Duomo in Milan. It measured about 67.6 metres long and 45.3 metres wide. Its museum-displayed remains are visible in the mezzanine of the Duomo station on metro line M1.

Basilica di Santa Tecla was founded around 350, probably under Emperor Constans, and was first called Basilica Maior or Basilica Nova because it was larger and newer than the neighbouring Basilica Vetus. In 355 Constantius II convened the Council of Milan there, and the Arian bishop Auxentius was installed in the church. It was demolished in 1461 to make way for the Duomo; English sources give 1458.

The names basilica maior and basilica nova came from its size and recent construction compared with the older basilica vetus. With the basilica vetus, the baptistery of San Giovanni alle Fonti and that of Santo Stefano alle Fonti it formed Milan's episcopal complex. In 355 the Council of Milan met inside it, and the Arian bishop Auxentius held its see until 374.

The excavated remains of the basilica are displayed in the mezzanine of the Duomo station on metro line M1, directly beneath today's Piazza del Duomo. Look for the archaeological display as you pass through the station concourse; the finds were brought to light during construction work and are visible without a separate ticket.

The site held religious importance long before the Christian era, as a temple dedicated to the goddess Minerva once stood there. Earlier cultures had already left their sacred marks at this location before the Christian building was constructed.