Dermot Anthony O'Reilly (b. 1942, Dublin, Ireland – d. February 17, 2007, St. John's, Newfoundland and Labrador) was an Irish-born Canadian musician, producer and songwriter.

O'Reilly was a member of Ryan's Fancy and became a solo artist when the band disbanded in 1983. He was educated at Inchicore, County Dublin.

In March 1968, O'Reilly emigrated to Toronto where he met future bandmates Fergus O'Byrne and Denis Ryan. He was one of the founding members of The Sons of Erin and helped form the band Sullivan's Gypsies in 1970.

In 1971, O'Reilly, O'Byrne and Ryan moved to St. John's and began performing as Ryan's Fancy. Ryan's Fancy became a popular Irish group that released 12 albums and hosted a successful television program for several seasons. O'Reilly wrote and produced many Irish songs as a member of Ryan's Fancy, as a solo artist and later as a member of the group Brishney. O'Reilly performed regularly with Fergus O'Byrne.

In 2004, Ryan's Fancy was honored with a Lifetime Achievement Award by the East Coast Music Association. After Ryan's Fancy disbanded, O'Reilly founded Piperstock Productions, a video production and marketing company based in Torbay, Newfoundland and Labrador.

Fergus O'Byrne is an Irish-Canadian folk musician, best known as a member of the popular Irish-Newfoundland band trio Ryan's Fancy, and as a banjo, concertina and bodhrán player.

O'Byrne was born in Dublin, Ireland. In the late 1960s, he emigrated to Toronto, Canada, where he met Dermot O’Reilly, Ralph O'Brien and Gary Kavanagh and performed as a member of the The Sons of Erin band. When The Sons of Erin parted ways, O'Byrne, Kavanagh and O'Reilly completed their remaining tour commitments as O'Reilly's Men and later formed Sullivan's Gypsies with Don Sullivan.

In 1971, O'Byrne moved to St. John’s Newfoundland with the rest of the trio of Ryan's Fancy to begin what was to become a very recognizable music icon in the traditional Irish folk music for Newfoundland.

In 1983 the band broke up, and O'Byrne started a solo and freelance career, touring throughout Canada, the United States, Europe, and Hong Kong.

In 1987 O'Byrne graduated from Memorial University of Newfoundland with a degree in Education, then serving on the Board of Directors of the St. John's Folk Arts Council and the programming committee of the Newfoundland and Labrador Folk Festival in St. John's.