Jolanthe von Brandenstein (15 August 1925 – 4 February 2019), known by her pen name Leonie Ossowski, was a German writer.
She also wrote under the name Jo Tiedemann.
She wrote novels, including the novel for young adults Die große Flatter which was filmed as an award-winning TV play, screenplays such as for Zwei Mütter, stories and non-fiction books.
Notable awards include the Hermann Kesten Medal of the Pen Centre and the Adolf-Grimme-Preis.