August Vandekerkhove (Kanegem, 15 October 1838 - Mâcon, 24 March 1923) was a Belgian writer, art-painter and inventor. He wrote under the pseudonym S.U.Zanne. He started a movement he called Cosmosofie (Cosmosophy), which he claimed it to be the anti-thesis of Theosophy. He was a friend of the French occultists and Martinists Papus an Jean Bricaud.He met Helena Blavatsky in Paris in 1884 and also in the United States between 1865 and 1880, but they could not get along with each other.