2004–05 Celtic League

The 2004–05 Celtic League was the fourth Celtic League season, and the second following the introduction of regional rugby in Wales. It involved Irish, Scottish and Welsh rugby union clubs. The restructured Celtic League saw the Welsh regional side the Neath-Swansea Ospreys finish top of the table to take the title.

Leading scorers
Note: Flags to the left of player names indicate national team as has been defined under IRB eligibility rules, or primary nationality for players who have not yet earned international senior caps. Players may hold one or more non-IRB nationalities.