Notre-Dame-de-l'Osier is a commune in the Isère department in southeastern France.

A church was built on the site of the apparition and completed in 1858.

It became a Basilica following a decree by Pope Pius XI on 9 September 1924.

A house of the Missionary Oblates of Mary Immaculate was established in the commune in 1834 and ceased activity in 1997.

Up to 11 hotels were active in the town, welcoming pilgrims and tourists, but the last one closed down in 2001, the pilgrimage attracting less and less crowds.