Christopher Vermeulen (born 19 June 1982) is a retired Australian motorcycle racer. He competed in the Supersport World Championship and the Superbike World Championship before racing in the premier MotoGP class between 2005 and 2009, most prominently as a member of the Suzuki MotoGP team, winning the 2007 French Grand Prix.

Vermeulen won the World Supersport Championship for the Ten Kate Honda team in 2003. He then raced in the Superbike class in 2004 and 2005 for the Ten Kate Honda team, finishing as series runner-up in 2005. From 2006 he joined the elite MotoGP series, for the Rizla Suzuki MotoGP Team. During his career, Vermeulen was regarded as a wet-weather expert and is affectionately nicknamed 'Vermin' on account of his last name.

Vermeulen was born in Brisbane, Australia on June 19, 1982. In 1999 he raced in the Australian Superbike Championship, despite only having participated in a handful of professional races beforehand. He took his Yamaha to 8th in the championship, with a best result of 4th, and the privateer championship for non-factory riders. His mentor Barry Sheene then arranged rides for him in Britain in their Supersport and Superstock classes, and success in these gave him his World Supersport break with Castrol Honda.

Initial success in a few late-2000 races did not translate into a successful 2001, as he only managed a single top 5 finish. However, in 2002 he linked up with Dutch team owner Gerrit Ten Kate, taking his first poles and podiums en route to 7th in the championship in the 2002 season. He became the team's lead rider for 2003, and became series champion comfortably with four victories, becoming the youngest ever winner.

When Ten Kate arranged a deal to run a Honda Fireblade in World Superbikes for 2004, Vermeulen was the natural choice to ride it. The team did their own development on the bike (in its first test they still used a road-bike clutch), but he still won four races and briefly led the championship before finishing 4th, as the only non-Ducati in the top 8.

For 2005, the championship had many Yamaha and Suzuki bikes, as well as 4 more Hondas including a second Ten Kate entry for Karl Muggeridge. Vermeulen continued to record victories, and took his first pole at Assen in the Netherlands, the country in which his grandfather was born. Victory in the first race at Imola took him to within 55 points of veteran compatriot Troy Corser's lead, but the cancellation of the second race due to heavy rain meant that only 50 points were still available from the remaining round's 2 races. He still comfortably finished as series runner-up.

Vermeulen rode factory bikes for Honda in the Suzuka 8 Hours race and, because of sponsorship and manufacturer relationships (Japan Tobacco and Honda, as the Ten Kate Honda team was sponsored by Winston a Japan Tobacco brand), also rode a Camel Pons Honda GP bike at the tail end of the 2005 season.

Vermeulen's progress towards a factory Honda ride seemed assured but Honda were only offering him another year in World Superbike, and Japan Tobacco had switched to Yamaha in MotoGP, so he made the bold decision to quit HRC and go with team Suzuki who signed him in 2006 alongside fellow youngster John Hopkins.