Dion Phaneuf (born April 10, 1985) is a Canadian (Canada) professional ice hockey defenceman (Defenceman (ice hockey)) currently playing for the Toronto Maple Leafs of the National Hockey League. He was drafted ninth overall in the 2003 NHL Entry Draft by the Calgary Flames, and made his NHL debut in 2005 after a four year junior career with the Red Deer Rebels of the Western Hockey League in which he was twice named the Defenceman of the Year (Bill Hunter Memorial Trophy). He set a Flames record for most goals by a first-year defenceman and was named a finalist for the Calder Memorial Trophy as top rookie in 2005-06 (2005-06 NHL season). Two years later, he was a finalist for the James Norris Memorial Trophy as top defenceman, though he did not win either award. Phaneuf is a two-time NHL All-Star (NHL All-Star Game). He has represented Canada internationally three times in his career, winning silver and gold medals at the World Junior Hockey Championship (IIHF World U20 Championship) in 2004 and 2005 respectively, and a gold medal at the 2007 Mens World Ice Hockey Championships.

Phaneuf is loathed by his opponents for his physical play as he has been rated one of the NHLs top hitters by his peers while also being accused of trying to injure his opponents at times. His much publicized relationship with actress Elisha Cuthbert also attracted controversy following disparaging remarks by former Dallas Stars forward Sean Avery. Phaneuf is active in the community; the Flames honoured Phaneuf for his role as an ambassador to the Alberta Childrens Hospital where he participated in events that help sick and injured children during his time in Calgary.