Marcin Załuski (1700–1765) was an 18th-century Roman Catholic Bishop of Płock and statesman, in Poland.
He was born into the Junosza noble family, the son of Alexander Joseph Zaluski and his wife Teresa Podkańskich.
He also went to the University of Vilnius (1718–1721) followed by Rome (1722–1723), where he studied theology and in Florence, where he earned a law degree.
This was due manly to support of his brother Andrzej Stanislaw Zaluski, then Bishop of Płock.
[2][3] On 13 Aug 1696 he was appointed Auxiliary Bishop of Płock, by his close relative Ludwik Bartłomiej Załuski.