The 2003 Rugby Canada Super League season was the sixth season for the RCSL.
| Team | Pld | W | D | L | F | A | +/- | BP | Pts | |
|---|---|---|---|---|---|---|---|---|---|---|
| Calgary Mavericks | 6 | 5 | 0 | 1 | 239 | 110 | +129 | 5 | 25 | |
| Vancouver Island Crimson Tide | 6 | 4 | 0 | 2 | 228 | 95 | +133 | 5 | 21 | |
| Saskatchewan Prairie Fire | 6 | 4 | 1 | 1 | 186 | 123 | +63 | 2 | 20 | |
| Vancouver Wave | 6 | 3 | 0 | 3 | 181 | 127 | +54 | 4 | 16 | |
| Fraser Valley Venom | 6 | 3 | 1 | 2 | 181 | 150 | +31 | 2 | 16 | |
| Edmonton Gold | 6 | 1 | 0 | 5 | 91 | 252 | -161 | 0 | 4 | |
| Manitoba Buffalo | 6 | 0 | 0 | 6 | 48 | 307 | -259 | 0 | 0 |
| Team | Pld | W | D | L | F | A | +/- | BP | Pts | |
|---|---|---|---|---|---|---|---|---|---|---|
| Toronto Xtreme | 4 | 4 | 0 | 0 | 188 | 52 | +136 | 3 | 19 | |
| Newfoundland Rock | 4 | 3 | 0 | 1 | 129 | 36 | +93 | 4 | 16 | |
| Nova Scotia Keltics | 4 | 2 | 0 | 2 | 54 | 98 | -44 | 0 | 8 | |
| Ottawa Harlequins | 4 | 1 | 0 | 3 | 45 | 116 | -71 | 0 | 4 | |
| New Brunswick Black Spruce | 4 | 0 | 0 | 4 | 54 | 168 | -114 | 1 | 1 |
The MacTier Cup is awarded to the RCSL Champions. The Calgary Mavericks (Western Division champions) defeated the Toronto Xtreme (Eastern Division Champions) 40–24 in the Championship Final, played in Calgary, Alberta on 26 July 2003. With the win, the Calgary Mavericks became the first team outside of British Columbia to win the MacTier Cup.