Cath McKinnon graduated from Flinders University Drama Centre, South Australia, and was a founding member of the Red Shed Theatre Company, working as writer and director. Among her plays are Immaculate Deceptions, A Rose by Any Other Name, The Road to Mindanao, Station Z, Hurt, and As I Lay Dreaming, a body of work spanning the period from the 1980s into the 2010s. She has also directed for the State Theatre Company of South Australia. After a period in South Australian theatre, she moved to Sydney to complete a Masters in Creative Writing at UTS, where she began her first novel.
McKinnon published her first novel, The Nearly Happy Family, in 2008, and followed it in 2017 with the novel Storyland, written while she was undertaking a PhD at Flinders University.
McKinnon's work has been nominated for AWGIE Awards, the Jill Blewett's Playwright's Award, and Indie Awards.