Julien Gustave de Graef ( June 20, Rotterdam, Hilversum, 1883 - april 29, 1951), better known as Jules Verstraete, was a Dutch stage, film and radio play actor. He has also used the pseudonym as actor Aug. van Zuylen.
He was the son of the Belgian actress Marie Verstraete and the Director and actor Willem van Zuylen. Already in 1898 at the age of fifteen, he had his first toneelrol in Antwerp. In 1910, he married Pauline Burns, with whom he had four children, all of whom were also an actor or actress: Mieke, Jeanne, Guus and Bob. His thirty-year Jubilee as an actor In 1928 fourth Verstraete. He then played at the New Rotterdam Scene in the piece the pastor of Neuvillette.  he made his debut on the silver screen in 1934 with a role in the film dead water .
In the beginning of the Second World War he joined with Jeanne on to an actors company that largely from NSBmembers and sympathizers existed.  these actors played in radio plays for the Dutch Central Broadcasting, a broadcasting company that was founded by the occupiers. In August 1945, the honour Board for the scene that Verstraete because of "treason to the highest cultural values" for ten years, no longer was allowed to work as a stage actor. 
- Dead water (1934)
- The girl with de Beer Hat (1934)
- Rubber (1936)
- At the stroke of twelve (1936)
- Spring Song (1936)
- The man without a heart (1937)
- The three wishes (1937)
- Bailey (1939)
- Rembrandt (1940)
- The last days of an island (1942)
- Dik Trom and his fellow-villagers (1947)
- Fifty years (1948)
- The dyke is close (1950)