Bartholomæus Deichman (9 August 1671 – 13 April 1731) was a Danish/Norwegian clergyman and Bishop. Deichman was born in Copenhagen, Denmark. He was the son of Carl Deichman (ca. 1639–1684) and his wife Else Pedersdatter (d. ca. 1675). He took his Baccalaureate in 1688. After theological exam in 1690, he studied in Frankfurt, Leiden and Utrecht. He first served as a chaplain with the Danish military auxiliaries. In 1697, he had secured a clerical position in Copenhagen. He served as Bishop of Viborg from 1700, and Bishop of the Diocese of Oslo from 1713 to 1730. In 1720–1721, he oversaw the beginning stages of the Norwegian church sale for the King.