Merriman has published five novels and three short story collections. Her first novel, Leaving the Light On, won the Ruth Hadden Memorial Award in 1992. Her collection of stories, Silly Mothers, was shortlisted for 1992 Wales Book of the Year, and she has twice won a Rhys Davies short story award, in 1991 and 1998. Many of her short stories have been broadcast on BBC Radio 4.
She also edited Laughing, Not Laughing: Women Writing on 'My Experience of Sex', an anthology of Welsh women writing frankly about their sexual experiences, which won the publications category of the 2004 Erotic Awards.
Her writing often addresses women's experiences. State of Desire addresses reawakening sexuality after bereavement. Merriman states that two of her novels (Leaving The Light On and Fatal Observations), about domestic power and domestic violence, have their foundations in her eleven years' experience as a volunteer for the charity Women's Aid.
Merriman teaches writing at the University of South Wales, the erstwhile University of Glamorgan. She is a fellow of the Welsh Academy and until recently was co-chair of their members' committee. For several years she was fiction editor for the New Welsh Review, and she has judged numerous short story competitions.
- Leaving the Light On (1992)
- Fatal Observations (1993)
- State of Desire (1996)
- Broken Glass (1998)
- Brotherhood (2003)
Short story collections
- Silly Mothers (1991)
- Of Sons and Stars (1997)
- Getting a Life (2001)
- Laughing, Not Laughing: Women Writing on 'My Experience of Sex' (Honno; 2004)
- "academi.org". academi.org. Retrieved 10 April 2015.
- "S c r a w l - Catherine Merriman interview". virgin.net. Retrieved 10 April 2015.
- 2004 Erotic Awards (accessed 19 February 2009) Archived December 26, 2008, at the Wayback Machine.
- University of Glamorgan: People: Catherine Merriman (accessed 18 February 2009)
- Academi Fellows (accessed 8 February 2008)
- Academi: Members Committee (accessed 18 February 2009)