The 2003 South American Rugby Championship was the 25th edition of the competition of the leading national rugby union teams in South America.

The tournament was played in Montevideo, with four teams participating. Paraguay and Brazil (winner of the 2002 "B" championship played before a play-off to obtain qualification.

Argentina won the tournament.

Preliminary

Final phase

Standings Three points for victory, two for a draw, and one for a loss {| class="wikitable" |- !width=165|Team !width=40|Played !width=40|Won !width=40|Drawn !width=40|Lost !width=40|For !width=40|Against !width=40|Difference !width=40|Pts |- bgcolor=#ccffcc align=center |align=left| Página de la IRB - South American Championship 2003 (partidos de Argentina) |3||3||0||0||225||3||+ 222||9 |- align=center |align=left| Página de la IRB - South American Championship 2003 (partidos de Uruguay) |3||2||0||1||73||52||+ 21||7 |- align=center |align=left| |3||1||0||2||118||69||+ 49||5 |- align=center |align=left| |3||0||0||3||7||299||- 292||3

Results Page of IRB - South American Championship 2003 First round

Second round

Third round

References