On June 30, 2014, Mercer was appointed an Officer of the Order of Canada by David Johnston, Governor General of Canada, for "his ability to inspire and challenge Canadians through humour" and his work with charitable causes. He was formally invested into the Order in a ceremony at Rideau Hall on September 23, 2015. The same year, he was inducted into the Canadian Disability Hall of Fame. In 2019, Mercer received the Lifetime Artistic Achievement Award as part of the Governor General's Performing Arts Awards.