St Peter’s Basilica marks 400 years on 18 November

St Peter’s Basilica (Basilica di San Pietro) in Vatican City will host a Mass on 18 November 2026 marking the 400th anniversary of its dedication. Pope Leo XIV is scheduled to preside at 5pm, giving travellers a precise date for a major religious event at the Vatican.

St Peter’s Basilica marks its dedication on 18 November

The Vatican’s official calendar lists the Dedication of the Basilica of Saints Peter, Apostle, as a Holy Mass at St Peter’s Basilica on Wednesday 18 November 2026. The entry identifies the occasion as the 400th Anniversary of the Dedication of St Peter’s Basilica and gives the start time as 5pm.

The Holy See’s liturgical office has also published an official notice for the celebration. It says Pope Leo XIV will preside at the Eucharistic celebration for the solemnity of the dedication, held in the basilica at 5pm. The notice places the event within the fourth centenary of the building’s dedication and sets out separate arrival arrangements for clergy taking part in the liturgy. The Vatican calendar entry provides the date, venue and anniversary detail.

The 2026 Mass connects the basilica with its 1626 completion

The date is closely tied to the building’s history. The present basilica was dedicated on 18 November 1626, four centuries before the 2026 Mass. Its first stone was laid by Pope Julius II on 18 April 1506, beginning a major rebuilding project on the site of the earlier Constantinian basilica.

The official basilica site identifies the tomb of Saint Peter beneath the main altar and describes the Vatican Grottoes as a lower level of vaults built between 1590 and 1591. It also records the dome’s association with Michelangelo, Giacomo della Porta and Domenico Fontana, while Saint Peter’s Square was designed by Gian Lorenzo Bernini. These parts give the 18 November liturgy a direct link to the building’s fabric, its altar and its long religious history. Further details appear in the basilica’s official guide to the basilica.

Vatican City heritage frames the anniversary celebration

St Peter’s Basilica stands at the centre of Vatican City, in front of the circular piazza and its double colonnade. UNESCO describes the basilica as being erected over the tomb of Saint Peter and as part of the artistic and architectural ensemble that gives Vatican City its World Heritage status.

UNESCO inscribed Vatican City in 1984. Its description connects the present basilica with the fourth-century foundation established by Constantine and with the Renaissance reconstruction completed in 1626. The anniversary Mass therefore falls on the same calendar date as the dedication that concluded the present building’s construction. The UNESCO profile of Vatican City records the site’s heritage status and historical setting.

Visiting St Peter’s Basilica: what travellers from Western Europe should know

• The anniversary Mass takes place at St Peter’s Basilica on 18 November 2026 at 5pm.
• The celebration marks the 400th anniversary of the dedication on 18 November 1626; the official notice separately gives clergy arrival arrangements.
• The venue is in Vatican City, at the centre of the Vatican complex and beside Saint Peter’s Square.
• The building contains the main altar above Saint Peter’s tomb, while the Vatican Grottoes lie below the basilica.
• The present basilica belongs to the Vatican City World Heritage property inscribed by UNESCO in 1984.

The date offers a focused reason to visit the Vatican in November 2026: the scheduled Mass places the anniversary directly inside the building whose dedication it commemorates.

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Frequently asked questions about St Peter’s Basilica

When does the dedication Mass take place at St Peter’s Basilica?

The Mass is scheduled for 5pm on 18 November 2026 at St Peter’s Basilica in Vatican City. It marks the 400th anniversary of the dedication.

What is St Peter’s Basilica?

It is the Vatican basilica built over the tomb of Saint Peter. The present building was begun in 1506 and completed in 1626.

Where is St Peter’s Basilica and how do you get there?

It is in Vatican City, beside Saint Peter’s Square and within the Vatican complex. The basilica stands at the centre of the UNESCO-listed Vatican City property.