Paul Andries van der Bijl or alternatively Van der Byl (23 May 1888 – 1939) was a South African mycologist known for his work on polypores or bracket fungi.

[1] Born on his father's farm in the Paarl district of Cape Colony, he graduated from the University of Stellenbosch (formerly Victoria College) in 1909.

[2] In 1911 van der Bijl was appointed mycologist and phytopathologist at the South African National Collection of Fungi.

[3] In 1915 he headed the newly established phytopathological laboratory at the National Herbarium.

He became the first professor of plant pathology in South Africa at the University of Stellenbosch in 1921.