Cathedral of the Assumption of the Blessed Virgin Mary, Catholic cathedral in Tuam, Ireland.

The Cathedral of the Assumption of the Blessed Virgin Mary, known as Tuam Cathedral, is the Roman Catholic cathedral of the Archdiocese of Tuam, built in the Gothic Revival style in local limestone. It replaced the medieval St Mary's Cathedral, from which Catholic clergy were dispossessed after William Mullaly was appointed Archbishop for the Established church under Queen Elizabeth I. John MacHale, Archbishop of Tuam, is buried before the high altar, and John de Burgh in the Oratory of St Jarlath.

Before the Reformation, Tuam's diocesan cathedral was St Mary's, built in the 14th century on the site of an earlier church. When Queen Elizabeth I appointed William Mullaly as Archbishop of Tuam for the Established church, the Roman Catholic clergy were dispossessed of it. Nearly three centuries passed before a relaxation of the Penal Laws allowed the present cathedral to be built as a replacement.

The cathedral is the seat of the Archbishop of Tuam, making it the main Catholic church for a wide area of County Galway and beyond. Weddings, funerals, and feast day Masses draw people from surrounding villages, giving the building a role that extends well beyond Sunday services.

The cathedral is open throughout the year for both services and general visits, though access to some areas may be limited during Mass. Arriving outside of main service times, especially on Sundays and holy days, gives more freedom to walk around and take in the interior.

The cathedral holds the tomb of Archbishop John MacHale, placed before the high altar; he led the Archdiocese of Tuam from 1831 to 1881. Archbishop John de Burgh is buried in the Oratory of St Jarlath, and Archbishop Joseph Cunnane lies in the cathedral grounds.