Lena Ma participated in Miss World Canada. She finished as the 4th runner-up. She also received the Miss Photogenic and Miss Entrepreneur award. The winner of Miss World Canada 2008 was Leah Ryerse.
On March 21, 2009, Ma won the title of Miss World Canada 2009, the first Canadian woman of ethnic Chinese descent to do so. At Miss World Canada 2009, Ma also won the Miss Talent award (vocalist), Beauty With a Purpose Award (judged on community/charity volunteering), Best in Evening Gown Award, Best in Interview Award, and the Top Model Award. She represented Canada at the Miss World contest, held in December 2009 in South Africa. She won Miss World Talent (tied with Sierra Leone), which fast-tracked her to the Top 16, and eventually placed as 4th runner-up overall.