The 2004–05 season was Ulster Rugby's tenth under professionalism, and their first under head coach Mark McCall.
They competed in the Heineken Cup, the Celtic League and the Celtic Cup.
Former head coach Alan Solomons and forwards coach Adrian Kennedy left at the end of the previous season to join Northampton Saints.
[1] Backs coach Mark McCall was named as the new head coach,[2] with Allen Clarke as his assistant.
[3] Maurice Field replaced Clarke as head of the academy.
[4] In the Celtic League, they finished eighth.
Tommy Bowe was the league's second top try scorer with eight.
[5] In the Heineken Cup, they finished third in Pool 6, failing to qualify for the knockout stage.
They went out of the Celtic Cup in the quarter-finals, losing to Neath-Swansea Ospreys.
Neil Best was Ulster's Player of the Year.
Kieran Campbell won the IRUPA award for Try of the Year.
Props Hookers Locks Back row Scrum-halves Fly-halves Centres Wings Fullbacks Staff Players 1.
Rowan Frost (for Longwell), 19.
Paul Shields (for Brady), 17.
Paddy Wallace (for Humphreys), 22.
Andy Ward (for Feather 62), 20.
Paddy Wallace (for Howe 70).
Paddy Wallace (for Cunningham), 22.
Paul Shields (for Brady), 17.
Paddy Wallace (for Cunningham), 22.
Andy Ward (for Feather), 20.
Andy Ward (for Feather), 20.
Tim Barker (for Longwell), 19.
Andy Ward (for Feather), 20.
Paddy Wallace (for Larkin), 22.
Tim Barker (for McCullough), 19.
Andy Maxwell (for S. Young).
Andy Maxwell (for S. Young).
Paddy Wallace (for Cunningham 60), 22.
The Ulster Rugby Awards ceremony was held at the Ramada Hotel on 12 May 2005.