William Groulx (born March 11, 1974) is an American wheelchair rugby player and cycler, and a member of the United States wheelchair rugby team. He was part of the US team that took the gold medal at the 2008 Paralympic Games in Beijing, and a bronze medal in Athens in 2004. He won three medals for cycling in the 2016 Paralympics. He served in the United States Navy from 1995 to 2001. In 2001, he had a spinal cord injury after a motorcycle accident. He was nominated for an ESPY Award in 2009, in the category Best Male Athlete with a Disability. He is a member of the Paralyzed Veterans of America.