The 2003 NRL Grand Final was the conclusive and premiership-deciding match of the 2003 NRL season. In what was a contest of Sydney's east versus west, defending premiers the Sydney Roosters played against minor premiers the Penrith Panthers. The first grand final since 1996 to feature two Sydney-based teams was played on the night of Sunday, 5 October at Telstra Stadium in the inner western suburb of Sydney Olympic Park. Domestically, live free-to-air television coverage was provided by Nine's Wide World of Sports. The match was also broadcast live in the United States by Fox Soccer.

The Sydney Roosters are an Australian professional rugby league football club based in the Eastern Suburbs and parts of inner Sydney including the CBD. The club competes in the National Rugby League (NRL) competition. The Roosters have won fifteen New South Wales Rugby League (NSWRL) and National Rugby League titles, and several other competitions. First founded as the Eastern Suburbs District Rugby League Football Club (ESDRLFC), it is the only club to have played in every season at the elite level, and since the 1970s has often been dubbed the glamour club of the league. The Sydney Roosters have won 15 premierships, equal to the record of the St George Dragons. Only the South Sydney Rabbitohs have won more premierships. The club holds the record for having won more matches than any other in the league, the most minor premierships and the most World Club Challenge trophies. The Sydney Roosters are one of only two clubs to finish runners-up in their inaugural season. Currently coached by Trent Robinson and captained by James Tedesco, the Roosters play home games at the Sydney Football Stadium.