The 2008 Sydney Roosters season was the 101st in the club's history. They competed in the NRL's 2008 Telstra Premiership and finished the regular season 4th out of 16. Despite losing their first finals match, the Roosters got another chance the following week but were knocked out by the New Zealand Warriors.
The Roosters have had a rather significant amount of player movement which will result in an extensive squad change from the 2007 season. The Roosters have lost 10 players from their 2007 squad and gained 4 new players, including high-profile signings Willie Mason and Mark O'Meley.