Stephanie Horner (born March 19, 1989) is a competition swimmer from Canada.

After having won four medals at the 2007 Pan American Games, Horner competed for her native country at the 2008 Summer Olympics in Beijing, China, and at the 2012 Summer Olympics in London.

[1] Horner also made the 2011 Canadian World Championships team, qualifying in the 400-metre individual medley event at the 14th FINA World Championships in Shanghai, China.

[2] In April 2017, Horner was named to Canada's 2017 World Aquatics Championships team in Budapest, Hungary.

[3][4] In 2012 Horner was awarded the Queen Elizabeth II Diamond Jubilee Medal.