2003–04 Ulster Rugby season
| Ground(s) | Ravenhill Stadium (Capacity: 12,500) | ||
|---|---|---|---|
| Coach(es) | Alan Solomons | ||
| Captain(s) | Andy Ward | ||
| Top scorer | David Humphreys (204) | ||
| Most tries | Tyrone Howe (12) | ||
| League(s) | Heineken Cup (3rd in pool) Celtic League (2nd) Celtic Cup (champions)  | ||
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The 2003–04 season was Ulster Rugby's ninth under professionalism, and their third under head coach Alan Solomons. They competed in the Heineken Cup, the Celtic League and the inaugural Celtic Cup.
Ulster introduced a new logo this season, featuring a red hand surrounded by the outline shapes of two crossed rugby balls in red and black, which remains in use. A proposal to rebrand the team the "Ulster Knights" was discussed, but rejected.
The numbers of teams in the Celtic League was reduced from sixteen to twelve in a single league table, with a full home and away schedule increasing each team's fixture list from seven to 22 matches. There would be no playoffs to determine the league's champions, but a knockout competition, the Celtic Cup, was introduced alongside the league. This meant that the Irish provinces could now operate as full-time professional clubs, with provincial players no longer able to play for clubs in the All-Ireland League. Ulster finished second in the table. Tyrone Howe was the league's joint third leading try scorer with nine. In the Heineken Cup, they came third in Pool 1, not qualifying for the knockout stage. They won the Celtic Cup, defeating Edinburgh in the final.
Making their debuts for the province this season were props Bryan Young and Simon Shawe, lock Tim Barker, back row forward Roger Wilson, scrum-half Reece Spee, wing Tommy Bowe and centre Seamus Mallon. New signings were props Ronan McCormack and Rod Moore, locks Rowan Frost and Matt Mustchin, and centre Paul Steinmetz.
James Topping became only the second player, after Gary Longwell, to make 100 appearances for Ulster. Tommy Bowe was named IRUPA Young Player of the Year. Roger Wilson was Ulster's Player of the Year.
Head coach Alan Solomons and forwards coach Adrian Kennedy left at the end of the season to join Northampton Saints. Backs coach Mark McCall was named as the new head coach.