Mary-Jo Wormell (born 1947), better known as Mary Lyons, was a popular British writer of 45 romance novels for Mills & Boon from 1983 to 2001.
Wormell, along with two other prolific Mills & Boon authors, launched Heartline Publishing on 14 February 2001. The publishing house was meant to fill the gap between Mills & Boon and mainstream fiction. The publishing house appears to have closed as the website is now defunct.
Wormell was a Conservative Party parliamentary candidate.