Orlaith McAllister (born 26 April 1979) is a model from Belfast, Northern Ireland. She was runner up in the 1999 Miss Northern Ireland competition, losing out to Zöe Salmon. She entered the house of Big Brother UK 6 on Day 29 and was directed to the Secret Garden with fellow new housemates Eugene and Kinga.
Orlaith has since embarked on a career as a glamour model, appearing half-naked in weekly men's magazines such as FHM, Nuts and Zoo. Orlaith was one of the competitors in the 2006 Miss Great Britain contest, but, despite being favourite for the title lost out to Danielle Lloyd, Miss Warrington.
In February 2007, Orlaith gave birth to a baby girl named Eva with her lucky fiancé, Irish property developer and presenter Gary McCausland. In April 2007, it was announced that the pair had split and Orlaith had returned to Belfast. Orlaith and Gary also have a son, Anthony, born in early 2009.