Rebecca K Reilly (born 1991) is a New Zealand author. She is of Ngāti Hine and Ngāti Wai descent. Her debut novel Greta & Valdin (2021) received the 2019 Adam Foundation Prize in Creative Writing. At the 2022 Ockham New Zealand Book Awards, it was shortlisted for the Jann Medlicott Acorn Prize for Fiction and received the Hubert Church prize for the best first book of fiction.