Kelley Armstrong is a Canadian writer, renowned for her fantasy novels since 2001. She has published thirty-one fantasy novels, including thirteen in her Women of the Otherworld series, five in her Cainsville series, six in her Rockton series, three in her Darkest Powers series, three in her Darkness Rising trilogy, and three in the Age of Legends series. Additionally, she has published three stand-alone teen thrillers and three middle-grade fantasy novels in the Blackwell Pages trilogy, co-authored with Melissa Marr.

Beyond these, she is the author of three crime novels, the Nadia Stafford trilogy. Armstrong has also written several serial novellas and short stories for the Otherworld series, some of which are available for free on her website. A Canadian TV series, based on the Women of the Otherworld called Bitten, aired for three seasons on Space and SyFy starting in 2014.

Armstrong has been storytelling since before she could write. Her first written attempts were notably unique, often featuring undead girls and evil dolls, which puzzled her teachers. Despite efforts to encourage "normal" stories, Armstrong remained true to her imaginative nature. Today, she continues to craft tales of ghosts, demons, and werewolves from her basement writing dungeon in southwestern Ontario, where she lives with her husband, children, and many pets.