Waltraut Cooper (born 1937, Linz, Austria), is an Austrian artist, generally described as Light Artist, primarily concerned with Art and Science, Concept Art, Digital Art.

Waltraut Cooper studied mathematics and theoretical physics at the University of Vienna and the Paris-Sorbonne. After teaching at the University of California, Santa Barbara, she began a career as an artist and studied painting and graphic arts in Lisbon and Frankfurt am Main, followed by teaching at the University of Arts in Linz. She speaks German, Latin, English, French, Italian, Spanish, Portuguese, Polish and Russian.

Works on the theme of art and science as well as large-scale light installations were presented at the Venice Biennale 1986 / Art and Science, at the Venice Bienniale 1995, at a project of the City of Venice for the 2009 Biennale, Time Space Existence / Venice Architecture Biennale 2014 and Time Space Existence / Venice Architecture Biennale 2016. Further works were created in Vienna, Berlin, Rome, Paris, Montreal, Boston, Washington, New York and Peking.

Waltraut Cooper is regarded as a pioneer of digital art, and her Klangmikado (based on the game of “pickup sticks”), a commissioned work of Ars Electronica in 1984, as a classic of digital art. She has worked regularly with her husband, the mathematician James Bell Cooper, and her daughter Angela Cooper.

Her work, which focuses on media, light and architecture, has received numerous prizes [4]. She is a member of the International Women's Forum, member of the board of trustees of the Austrian Society for Cultural Policy, member of the International Kepes Society, Hungary, and corresponding member of the Académie Européenne des Sciences, des Arts et des Lettres, Paris. On May 18, 2010, the Ministry of Culture awarded her the honorary title of professor.

Cooper began her series of space installations in the mid 70's and progressed from traditional techniques to concentrate on light as the central medium for the development of her creativity. She now illuminates façades and whole buildings with computer controlled light and sound installations, which create an intensive connection to the public space. "Scarcely any artist has explored the tension between poetry and computer, between light and color as much as she has".

For her large project RAINBOW TRILOGY 1999–2015, a series of historically significant buildings in selected metropolises were flooded by colored light. This project had three components:

• RAINBOW ACROSS AUSTRIA 1999 at the end of a century darkened by two World War
• RAINBOW FOR EUROPE 2004 on the occasion of the entry of ten new member states to the EU as the end of the wars in Europe
• WORLDWIDE RAINBOW 2015, 70 years after the end of the World Wars as a gesture of hope for world peace, the greatest challenge of today.

Together, they stretched a rainbow across Austria, Europe, and finally, in 2015, over the whole planet, highlighting an iconic building on each continent. The project "Rainbow Trilogy" was presented at the Venice Architecture Biennale 2014.

She currently resides in Vienna, Austria.