Dame Elizabeth Violet Blackadder, Mrs Houston, (born 24 September 1931- died 23 August 2021) was a Scottish painter and printmaker. She was the first woman to be elected to both the Royal Scottish Academy and the Royal Academy.
In 1962 she began teaching at Edinburgh College of Art where she continued until her retirement in 1986. Blackadder worked in a variety of media such as oil paints, watercolour, drawing and printmaking. In her still life paintings and drawings, she considered space between objects carefully. She also painted portraits and landscapes but her later works contain mainly her cats and flowers with extreme detail. Her work can be seen at the Tate Gallery, the Scottish National Gallery of Modern Art, and the Museum of Modern Art in New York, and has appeared on a series of Royal Mail stamps.
In 2012, Blackadder was chosen to paint Scottish First Minister Alex Salmond's official Christmas card.