St Mary's College, Blairs (commonly known as Blairs College), situated near Aberdeen in Scotland, was from 1829 to 1986 a junior seminary for boys and young men studying for the Roman Catholic priesthood.

[3] Lying on the south bank of the River Dee, between Kirkton of Maryculter and Aberdeen, the land on which the seminary was built was originally owned by the Knights Hospitallers of St John of Jerusalem, before passing to the Menzies family in 1542.

In 1827 the land was donated by John Menzies of Pitfodfels (1756-1843) to the bishops of the Roman Catholic Church in Scotland, and the original building, Menzies House, converted into a seminary for 25 pupils.

The new buildings were formally opened by Bishop Chisholm on 23 September 1903.

The college closed in 1986, but the chapel continue to be used as a place of worship.