Marianne Lienau (1935–2021) was a German cultural journalist, broadcaster and art enthusiast, born in Königsberg and later based in Cologne. She worked for Westdeutscher Rundfunk (WDR) from 1962 to 1997 and became particularly well known as co-founder and presenter of the influential cultural radio programme Kritisches Tagebuch. She also worked as a radio correspondent in Rome.

Lienau was a passionate collector of modern and contemporary art, and paintings attributed to her own artistic practice are recorded among her estate. These include colourful geometric abstractions in acrylic, characterised by simplified forms, strong blocks of colour and a clear interest in the visual language of modernism.