Simon Gagné (born February 29, 1980) is a Canadian professional ice hockey left winger who plays for the Philadelphia Flyers of the National Hockey League (NHL). He is an alternate captain with the Flyers and is currently the longest serving player on their roster.

Drafted out of the Quebec Major Junior Hockey League (QMJHL) 22nd overall in 1998, Gagné played major junior with the Beauport Harfangs and Quebec Remparts for three seasons. He began his NHL career with the Flyers in 1999–00 and was named to the NHL All-Rookie Team. He has appeared in two NHL All-Star Games and has won two Bobby Clarke Trophies with the Flyers as team MVP. Gagne is also considered to have one of the best shots ever to be seen in the NHL.

Internationally, Gagné has represented Team Canada on five occasions. He has won silver medals at the 1999 World Junior Championships and 2005 World Championships, while winning gold at the 2002 Winter Olympics and a World Cup championship in 2004.