Hildegard Joos (7 May 1909 in Sieghartskirchen, Lower Austria – 17 January 2005 in Vienna) was an Austrian painter and is known as the "Grande Dame" of geometric abstraction and constructivism in Austria.
After the Second World War, she studied at the Academy of Fine Arts in Vienna.
Joos was referred to as the "Grande Dame" of abstract painting in Austria.
Checkerboard and raster images were an important part of her artistic work.
In 2014, Viennese gallerist and art dealer Martin Suppan organized a retrospective of Hildegard Joos in the Vienna Künstlerhaus with more than 140 works on display.