Anna Maria Lovisa Wahlenberg (23 May 1858 – 29 November 1933) was a Swedish writer and playwright.

[1] In 1882, she debuted with her first collection of short stories Teckningar i sanden (Drawings in the Sand) under the pseudonym Rien (from Swedish 'nothing').

[1] She wrote two more collections of short stories, Hos grannas (1887) and I hvardagslag (1889), dedicated to a young woman's fight for financial independence.

[3] In 1888, Wahlenberg married Fritz Kjerrman, editor of the newspaper Dagens Nyheter, with whom she had two sons.

[3][5] In 1890, she deputed as a playwright with a comedy called På vakt followed by a prolific output of plays for amateurs and children as well as for professional actors that were frequently staged at the Kungliga Dramatiska Teatern (the Royal Dramatic Theatre) in Stockholm.