Grotta di Lourdes, Religious grotto in Vatican Gardens, Vatican City.

The Grotta di Lourdes is an artificial cave in the Vatican Gardens, built 1902–1905 as a scaled-down replica of the Lourdes grotto in France, including its surroundings. Its tall spire, reached by two side stairways, was demolished under Pius XI for safety, and the stairways followed in 1962 under John XXIII. It now stands as a simple structure with an altar and a small statue of the Immaculate Conception, set along the wall near Saint John's Tower.

Pope Leo XIII called for a replica of the Lourdes grotto in the Vatican Gardens, and on 1 June 1902 the Bishop of Tarbes and Lourdes, François-Xavier Schoepfer, presented it to him. The reproduction was made by Costantino Sneider of the Apostolic Palaces, with help from the Missionaries of the Immaculate Conception. A formal consecration followed on 28 March 1905 under Pius X, with his successor Pius XI present.

Every 31 May the Pope walks to the grotto at the end of the procession and celebrates Mass there; John Paul II did so on 31 May 2000 and Benedict XVI on 31 May 2011. The square courtyard in front served in the 1930s for the papal guard of honour at the oath-taking of new recruits. Below the small statue of the Immaculate Conception an inscription repeats Mary's words to Bernadette Soubirous.

The grotto stands along the wall leading to Saint John's Tower, beside a fountain and a marble plaque recording its history in Latin. It lies inside the Vatican Gardens, which can only be visited on guided tours booked in advance; the grotto is a stop on those routes rather than a separately accessible site.

The medallion at the entrance, made by Costantino Sneider of the Apostolic Palaces, shows the images of two popes. The grotto once had a tall spire reached by two side stairways; Pius XI ordered the spire demolished for safety, and John XXIII had the stairways removed in 1962.