Church of the Immaculate Conception of Mary (St. Marien), Grasdorf

The Church of the Immaculate Conception of Mary, also known colloquially as St. Mary, is the Catholic Church in Grasdorf, a district of the municipality of Holle in the district of Hildesheim in Lower Saxony. The church, named after the Marian title "Immaculate Conception", is located at Hildesheimer Straße 10 and belongs to the parish of St. Hubertus based at Wohldenberg Castle, in the Alfeld-Detfurth deanery of the Hildesheim diocese.

In addition to Grasdorf, the church's catchment area also includes the towns of Binder, Heersum, Luttrum and Wartjenstedt. In addition to being used by the parish, the church, together with the Evangelical Lutheran church in Grasdorf, also serves as a motorway church.