Rosannagh "Rosie" MacLennan (born August 28, 1988) is a Canadian trampoline gymnast. She is the 2013 World Trampoline champion, 2012 and 2016 Olympic champion, and 2011 and 2015 Pan American Games champion in the individual trampoline event. MacLennan was the Canadian National Women's champion in 2005, 2009 and 2011, and in 2007 was the World Champion in synchronized trampoline with Karen Cockburn. She has also won five silver and four bronze medals in World Championship competition in both the individual and synchro events. MacLennan trains at Skyrider's Trampoline Place in Richmond Hill, Ontario, with coach David Ross, who has coached all of Canada's Olympic trampolinists.
MacLennan was born in the township of King, Ontario. Her parents are Jane and John MacLennan. Her grandfather was selected as a gymnast for the 1940 Summer Olympics in Tokyo but was unable to compete as the games were cancelled due to the outbreak of World War II.Rosie MacLennon also sufferd a mild concussion before the 2015 Pan Am games in Toronto
MacLennan has competed internationally at various levels since 1999. In 2006 she paired with her training partner, the Olympian Karen Cockburn, in synchronized trampoline and the pair would go on to dominate the event internationally, winning eight consecutive World Cup events including the World Cup Finals in Birmingham in 2006. That year she also graduated from King City Secondary School, where she was a cheerleader during her final year.
In the 2007 World Championships in Quebec City they again won the event The pair hold the current female synchronized trampoline routine world record for difficulty with a DD of 14.20 which they scored in April 2007 at the Lake Placid Trampoline World Cup. Her results at the 2007 World Championships qualified her for the 2008 Summer Olympics in Beijing.