Louis Heyns Du Preez (born 9 July 1962) is a South African professor of zoology who specialises in parasitology and herpetology at the North-West University.

[2][3] His contributions to polystome research have led to a recently discovered Malagasy frog species, Blommersia dupreezi[4], being named in his honour.

[5][6] Du Preez grew up in Ficksburg and started his tertiary education at the University of the Free State located in the same province he was brought up.

In 1994 he obtained a PhD degree from the University of the Free State with a thesis titled 'Study of factors influencing the nature and extent of host-specificity among polystomatids (Polystomatidae: Monogenoidea) parasitic in Anura of southern Africa' under the mentorship of Dawid Kok.

In 2002 he established the African Amphibian Research Conservation Group and was later promoted Full Professor of Zoology in 2005 at North-West University.