Marianne de Pierres (born 1961) is an Australian science fiction author. Born in Western Australia, she did her undergraduate studies at Curtin University in Perth and later studied a Postgraduate Certificate of Arts in Writing, Editing and Publishing at the University of Queensland. She has been actively involved in promoting Speculative Fiction in Australia and is the co-founder of the Vision Writers Group, and ROR – wRiters on the Rise, a critiquing group for professional writers. She was also involved in the early planning stage of Clarion South.
The greater body of her work has seen publication in the UK and Australia. In 2004, her series of novels with the protagonist Parrish Plessis, a postapocalyptic bodyguard and bounty hunter, was published in the United Kingdom through Orbit Books and in 2005 in the United States through Roc Books. The novels in this series include Nylon Angel, Code Noir, and Crash Deluxe and have been adapted into a role-playing game. Her second series, Sentients of Orion comprises four books: Dark Space, Chaos Space, Mirror Space and Transformation Space, published in the United Kingdom through Orbit Books.Transformation Space won an Aurealis Award for Best SF novel in 2011.
In 2008 de Pierres began writing humorous crime under the pseudonym Marianne Delacourt. To date there are three novel novels in the Tara Sharp series: Sharp Shooter, Sharp Turn, Stage Fright. The first novel, Sharp Shooter received a Davitt Award in 2010 for Best Crime novel by an Australian woman.
Her young adult series, Night Creatures (Burn Bright, Angel Arias and Shine Light) was published by Random House, Australia. It featured a collaboration with Australian indie singer, Yunyu, who wrote songs to accompany the release of first two books.