Thierry Martens (29 January 1942 – 27 June 2011) was a Belgian author who wrote science fiction, detective novels, short stories and comics under the pen name Yves Varende.

Martens was the editor of the Franco-Belgian comics magazine Spirou between 1968 and 1977.

He published several highly documented anthologies[1] and studies about popular "Holmesian-style" French-language crime novels of the early twentieth century.

[2] Martens also authored some dark Holmesian pastiches in French as well as super-science novels.

[3]