The Sanctuary of Our Lady of Lourdes is a Catholic Marian shrine and pilgrimage site dedicated to Our Lady of Lourdes in the town of Lourdes, Hautes-Pyrénées, France. The sanctuary includes several religious buildings and monuments around the grotto of Massabielle, the place where the events of the Lourdes apparitions occurred in 1858, among them are three basilicas, the Basilica of Our Lady of the Immaculate Conception, the Rosary Basilica and the Basilica of St. Pius X, respectively known as the upper, lower and underground basilica.

The Lourdes apparitions are several Marian apparitions reported in 1858 by Bernadette Soubirous, the 14-year-old daughter of a miller, in the town of Lourdes in Southern France.