John Gabriel Anrep (4 December 1821 – 12 March 1907) was a Swedish genealogist and author.

[1][2] Gillingstam presents documentation that Anrep had personally discarded a lot of earlier parts of family trees of the nobility, for example as being mythical.

However, in his series 1858–1864, Nobility Genealogy, 4 volumes, it was a prerequisite from the House of Nobility that in order to use their material, Anrep must follow those (even mythical parts of) family tables strictly – i.e., he was not allowed to discard mythical parts of the pompous pedigrees in his publication.

This has been used as criticism against Anrep personally – that he published even mistaken genealogies.

Also, his publication has been used as evidence of the truthfulness of those mythical parts of genealogies, on basis of Anrep's authority – although he might personally be appalled to see his name used for such purpose, having himself left personal notes about unreliable portions.