Toronto Rock

 ( National Lacrosse League Teams ) 

In 2003, Toronto advanced to the championship game for the fifth straight year, once again as the visitors. The game was held in Rochester, where Rock had never won a game, but they prevailed in the lowest-scoring championship game in NLL history, winning 8–6.

Shortly before the 2004 season began, head coach and GM Les Bartley announced that he was fighting colon cancer, and was stepping down. Assistant coaches Ed Comeau and Derek Keenan were named interim coach and interim GM respectively. After a 2–4 start to the season, Comeau and Keenan were fired, and the Rock hired Terry Sanderson to try to turn the team around. The Rock went 8-2 the rest of the season, earning a first round bye after clinching the East Division regular season crown. However, the Buffalo Bandits came to town and upset the Rock 19–10, sending the Bandits to the first NLL championship game not featuring the Rock since they joined the league. Jim Veltman was honoured by the league by being named league MVP. This was the first year in the 10-year history of the award that it did not go to Gary Gait, Paul Gait, or John Tavares and the first Toronto Rock player to be named league MVP. In 2005, the Rock defeated the Rochester Knighthawks in the East Division Final by a score of 12–10 in front of approximately 17,200 fans at the Air Canada Centre. The Rock went on to defeat the Arizona Sting with a 19–13 win in front of an NLL record crowd of 19,432, becoming NLL champions for the fifth time in seven years and solidifying their distinction as an NLL dynasty. Colin Doyle was named league MVP, the second straight year that the award was won by a Rock player.

Despite the championship, the season ended on a sad note for the Rock franchise, as Les Bartley died of cancer at the age of 51 the day after the championship game. Bartley is remembered as an exceptional coach, having led the Toronto Rock to NLL Championships in 1999, 2000, 2002, and 2003.

In 2004, the NLL Coach of the Year Award was renamed the Les Bartley Award in honour of Bartley.

Kloepfer made his mark on the team quickly, trading perennial All-Star, former Rookie of the Year and league MVP Colin Doyle to the San Jose Stealth along with Darren Halls and a draft pick for first overall draft pick Ryan Benesch, Kevin Fines, Chad Thompson and two draft picks. Benesch had a very good rookie year, scoring 33 goals and winning the Rookie of the Year award, but the Rock under rookie coach Clark struggled to a worst-ever 6–10 record, barely making the playoffs. They lost the division semifinal against Rochester, who would go on to win their first championship since 1997.

In 2007, the Toronto Rock established an award also called the Les Bartley Award, given to "the Rock player that best exemplifies Les' emphasis on the importance of character and commitment to the team". The first winner of this award was team captain Jim Veltman.

Toronto's struggles continued in 2008, as the Rock lost their last five games of the season. They finished below .500 for the second straight year, and for the first time since their move to Toronto in 1999, the Rock finished out of the playoffs. Despite the losing season, goaltender Bob Watson was named Goaltender of the Year. 2008 also featured the final season of the only captain the Rock franchise had ever had, Jim Veltman. Veltman retired after fifteen seasons in the NLL, winning seven championships (two with the Bandits and five with the Rock). Chris Driscoll was named the new Rock captain. After starting the 2009 season with a 1–2 record, the Rock relieved Clark and assistant coach Veltman and Terry Bullen of their coaching duties, and hired former Chicago and Colorado coach Jamie Batley as the new Rock head coach. Clark and Bullen were fired, and Veltman was retained in an advisory position. The coaching change was not enough to propel the Rock back into the playoffs, however. They finished last in the East and out of the playoffs for the second straight year. Director of Lacrosse Operations Mike Kloepfer resigned shortly after the season ended.

Sanderson wasted no time in the rebuilding efforts, most notably re-acquiring Colin Doyle from Washington in exchange for Lewis Ratcliff, Tyler Codron and Joel Dalgarno. He also traded Luke Wiles to Washington and Bill McGlone to Philadelphia, and re-acquiring former Rock defender Sandy Chapman from Rochester. He then traded team captain Chris Driscoll to the Buffalo Bandits for another former Rock defender Phil Sanderson, and acquired Mike Hominuck from Edmonton Rush and Pat McCready from Buffalo, both for draft picks.

The moves paid off immediately, as the Rock began the 2010 season 6-1 en route to a 9–7 record. This was good for second place in the East and the Rock's first playoff berth in four years. In the playoffs, the Rock defeated Buffalo and Orlando on their way to their seventh Championship game, and first since 2005. The Washington Stealth, in their first season in Everett, Washington, proved too strong for the Rock and won the Championship 15–11.

In 2011, the Rock found themselves in the Championship game for the second straight year against the Washington Stealth, this time winning 8–7.

In August 2011, Dawick broke ground on constructing the new $20 million-dollar, privately financed Toronto Rock Athletic Centre (TRAC) in Oakville. The lacrosse facility, which opened in 2012, features two pads, one of which seats 500 fans, and serves as the Rock's practice facility as well as the team's offices. The arena has played host to exhibition NLL games, the NLL Entry Draft and the NLL Combine.

On May 11, 2021, Dawick announced that the Rock would relocate from Scotiabank Arena in Toronto to FirstOntario Centre in Hamilton, Ontario with a five-year arena lease with an option to extend the agreement afterwards. Their relocation will commence in time for the beginning of the 2022 NLL season in December 2021. The team name will not be changed despite the relocation to Hamilton due their branding as a team that has "always represented the GTHA".

It was originally announced that beginning in January 2024, the Rock would need to temporarily relocate their home games to the Paramount Fine Foods Centre in Mississauga, Ontario, as following their home games in December 2023 Hamilton's FirstOntario Centre would close for renovations for approximately two years. This also forced the Bulldogs (OHL) and Honey Badgers (CEBL) to temporarily and permanently relocate to Brantford and Brampton, respectively. However, in September 2023 it was announced that the renovations would be delayed and that the Toronto Rock would play the entirety of the 2023/24 season in Hamilton before temporarily relocating to Mississauga for the following season until the renovations are completed.

• Les Bartley (Class of 2006)
• John Mouradian (Class of 2008)
• Jim Veltman (Class of 2009)
• Dan Stroup (Class of 2010)
• Bob Watson (Class of 2011)
• Steve Dietrich (Class of 2012)
• Pat Coyle (Class of 2014)
• Terry Sanderson (Class of 2015)
• Josh Sanderson (Class of 2016)
• Colin Doyle (Class of 2021)
• Pat McCready (Class of 2021)
• Steve Toll (Class of 2021)