Fergus O'Byrne is a 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.

In the late 1960s, he immigrated to Toronto, Ontario, Canada, where he met Dermot O'Reilly, Ralph O'Brien and Gary Kavanagh and performed as a member of The Sons of Erin band.

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.

O'Byrne currently performs as part of a duo with Jim Payne, as a member of the band A Crowd of Bold Sharemen, and with his son, Fergus Brown-O'Byrne.

He also facilitates a program to encourage youth participation in music, under the auspices of the St. John's Folk Arts Council; this program features a yearly workshop and concert for young traditional musicians known as "Young Folk at the Hall."