Claudia Piñeiro (born 10 April 1960) is an Argentine novelist and screenwriter, best known for her crime and mystery novels, most of which became best sellers in Argentina. She was born in Burzaco, Buenos Aires province.

She has won numerous literary prizes, among them the German LiBeraturpreis for Elena Sabe and the Sor Juana Inés de la Cruz Prize for Las grietas de Jara. Six of her novels have been translated into English by Bitter Lemon Press and Charco Press, as well as adapted into feature films.

Her novel Las Grietas de Jara was adapted into a movie named Dark Buildings (A Crack in the Wall) in 2018, available on Prime Video. Her novel Elena Knows was also adapted into a film by the same name, which premiered on Netflix in 2023.

In April 2022, her novel Elena Sabe, translated into English by Frances Riddle as Elena Knows, was shortlisted for the International Booker Prize.