Conor Dermot McGuinness (born 29 March 1975) is an Irish former rugby union international.
McGuinness, a scrum-half from Dublin, played for St Mary's College and Connacht.
In the late 1990s, McGuinness represented Ireland as a scrum-half in 14 Test matches, debuting against the All Blacks at Lansdowne Road in 1997. He was widely regarded as the best player on field in Ireland's two-point loss to France in Paris during the 1998 Five Nations Championship. His run as Ireland's scrum-half ended in 1999 when he lost his place in the side to Tom Tierney, only a few months before that year's Rugby World Cup.
McGuinness's career was hampered by a serious foot injury which required multiple operations.