Robert Klippel AO (1920-2001) was an Australian constructivist sculptor and teacher. He is often described as Australia's greatest sculptor. Throughout his career he produced some 1,300 pieces of sculpture and approximately 5,000 drawings.

His work investigates the relationship between the organic and the mechanical; a duality that he saw as central to life and culture in the 20th century.

In 1964, art critic Robert Hughes called Klippel "one of the few Australian sculptors worthy of international attention".

Klippel always believed that art "doesn't have to say something". Many of his works are untitled, simply identified by a number, a purposeful way of allowing the viewer to interpret what the artist may or may not be saying with the work.

Klippel's work is represented in the majority of Australian public institutions. In particular, the National Gallery of Australia and the Art Gallery of NSW both have comprehensive collections of his sculptures, drawings and collages. In addition to his work in the National Gallery of Australia's Sculpture Garden, a bronze sculpture, commissioned by the South Australian Department for the Arts, is situated in the Adelaide Plaza, and James Fairfax presented a bronze sculpture to the City of Sydney which now stands outside the Museum of Contemporary Art.