Ludwik Bartłomiej Załuski (born 1 June 1661 – 24 December 1721 in Warsaw, Poland) was a Polish Cardinal of the Roman Catholic Church Auxiliary Bishop of Przemysl, and the Bishop of Płock.[1]
On 1 April 1699 he became bishop of Płock, replacing Andrew Chrysostom his brother. His reign as Bishop coincided with the Great Northern War, with some 50 destroyed churches.
However, he worked to rebuild and expand the number of churches. He also opened on 6 May 1710 a Seminary in Płock. In 1720 began construction on the back of the Church of our Lady of Graces in Warsaw and the Jesuit college there.[2]