At her second Olympic Games in 2012, Roseline Filion earned a 10m synchronized platform bronze with partner Meaghan Benfeito in London and finished 10th in the individual 10m event.
Earlier in 2012, Filion won silver in the 10m synchro event at the FINA World Cup and at the Senior National Championships with Benfeito. She also finished fourth in the 10m platform event.
In 2011, Filion competed at the Pan American Games in Guadalajara and won a silver with Benfeito in 10m synchro. At the FINA World Cup in 2010 the duo won bronze in the 10m synchro event. Filion made her Olympic debut in 2008 in Beijing and finished seventh in the 10m synchro event with partner Benfeito. In 2006, they won bronze at the FINA World Cup in the 10m and did the same in 2005 in Montreal at the World Championships.