Alexander Pietrangelo (born January 18, 1990) is a Canadian professional ice hockey defenceman currently playing for and serving as captain of the St. Louis Blues of the National Hockey League (NHL). He has played for the Blues in every season since 2008. As a junior, he played with the Niagara IceDogs and Barrie Colts of the Ontario Hockey League (OHL). In 2016, Pietrangelo was named captain of the Blues. Pietrangelo led the St. Louis Blues to victory in the 2019 Stanley Cup Finals over the Boston Bruins and scored the series-winning goal in Game 7.
Pietrangelo has competed with Team Canada at the junior and senior level, winning a gold medal win with Canada's under-20 team at the 2009 World Junior Championships. Individually, he was named Best Defenceman at the 2010 World Junior Championship and 2011 Men's World Championship. Pietrangelo was named to the 2014 Canadian Olympic hockey team and won a gold medal at the 2014 Winter Olympics.