Mary Bess Westenholz, pen name Bertel Wrads, (13 August 1857 – 8 May 1947) was an influential Danish Unitarian, women's rights activist, writer and editor.

In 1895, using the pen name Bertel Wrads, she published the essay collection Fra mit Pulterkammer (English: From My Loft), discussing marriage, women's rights and national affairs.

[3] By participating at meetings of the International Congress of Free Christians and other Religious Liberals in London, Amsterdam and Berlin, she was able to associate Danish Unitarianism with similar movements in Europe and the United States.

She snatched the speaker's bell, rang it vigorously and, pointing at the ministers' benches, declared: "Before you begin your work, you should know that in this chamber there is a man who has brought disgrace to Denmark.

Thanks to her friendship Dorothy Canfield Fisher, an American writer and member of the Book of the Month Club's selection committee, she was able to arrange for publication of Blixen's Seven Gothic Tales in 1934.