Knock basilica, Catholic basilica in Knock, Ireland

Knock Basilica is a large concrete church in the village of Knock, County Mayo, built as part of a pilgrimage site. It can hold around 10,000 people and stands alongside several smaller chapels on the same grounds.

In 1879, villagers reported seeing a vision at the wall of the old parish church, and the site soon drew growing numbers of pilgrims. The current basilica was built in the 1970s to give the expanding flow of visitors a large space for worship.

The shrine's name comes from the Irish "Cnoc Mhuire", the Hill of Mary, and its focal point is the gable wall of the old parish church where the 1879 apparition was reported. Pilgrims still walk past that wall, and a small stone from it is kept on the grounds. The basilica serves the Archdiocese of Tuam and is Ireland's National Marian shrine.

Mass is held daily throughout the year, and confession is available for those who wish to take part. The grounds are largely flat and open, making it easy to move between the basilica and the surrounding chapels.

Pope John Paul II visited Knock in 1979, the 100th anniversary of the reported apparition, marking the first papal visit ever made to Ireland. A small stone from the original church wall where the vision was seen is still kept on site.