Hartbert van Bierum (died 12 November 1150) was a bishop of Utrecht from 1139 to 1150.
Hartbert, or Heribert, in several translations, was consecrated as bishop on 24 July 1139.
The bishop loaned the prefecture of Groningen to his brother Ludolf, and his younger brother Leffart was given the castle of Coevorden in the south-east of Drenthe, which held control over the only road through the Bourtangerbog from Drenthe to Germany.
This nepotism formed the basis of the eventual loss of Drenthe for the Bishopric of Utrecht.
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