Stephanus Le Roux Marais (born 1896, Bloemfontein district, Orange Free State, South Africa, died 25 May 1979, Graaff-Reinet) was a South African composer.
He studied at the South African College of Music in Cape Town and at the Royal College of Music in London. In the subsequent 32 years he held various positions as church organist and teacher. He was a pioneer of the Afrikaans art song. In 1928 his "Vier Afrikaanse Sangstukke" (Four Afrikaans Song Pieces) was published. In the five years following, he was awarded 23 diplomas at the Cape Town Eisteddfod