Desmonde Florence Downing (26 November 1920 – 11 July 1975) was an Australian set and costume designer.

Born on 26 November 1920 at Neutral Bay, New South Wales, Desmonde Florence Downing was the eldest child of Violet Hester (née Sadler) and engineer Frank Hammersley Downing.

She was educated at Meriden Church of England Grammar School in Strathfield on a scholarship and completed the Intermediate there.

[1][7] This led to her designing costumes and sets for the stage, while also taking part in some of the plays.

[8] Downing died of cancer at Manly, New South Wales on 11 July 1975.