Claudia Guadalupe Martinez is an American author of children's books, best known for her middle grade contemporary debut The Smell of Old Lady Perfume.

[2] Her father passed away when she was eleven, an experience which she drew inspiration from for what would become her debut novel, The Smell of Old Lady Perfume.

[1] Her debut novel, a middle grade contemporary titled The Smell of Old Lady Perfume, was published with Cinco Puntos Press in 2008.

[6] It was published by Cinco Puntos Press in September 2014 and the novel won a 2015 Texas Institute of Letters Best Young Adult Book Award[4] and a 2015 NAACS Tejas Foco Best YA Fiction Award,[7] in addition to receiving a starred review from VOYA magazine.

[8] The official novel adaptation for the DreamWorks movie Spirit Untamed—which hit theaters June 4, 2021—was published by Little Brown Books for Young Readers April 2021.