Toni Petteri Lydman (born 25 September 1977) is a Finnish former professional ice hockey defenceman.

He first played competitively in his native Finland with Tappara, and HIFK of the SM-liiga before enjoying a lengthy career in the National Hockey League with the Calgary Flames, Buffalo Sabres and the Anaheim Ducks.

Calgary made it to the 2004 Stanley Cup Finals, but Lydman missed most of their playoff campaign due to injury.

Having lost the Olympic final (2006), World Championship final (1998, 1999), World Cup final (2004) and Stanley Cup Finals (2004), Lydman and his fellow countrymen Jarkko Ruutu and Sami Salo (Kimmo Timonen also belonged to the club before winning the Stanley Cup at the end of his career (2015)), are the only members of the unofficial "Quadruple Silver Club", a somewhat humorous reference to the Triple Gold Club and the unofficial "Quadruple Gold Club" for players who have won the most important championships available to the sport.

After completion of the lockout-shortened 2012–13 season, in which he finished the season heavily concussed from a Justin Abdelkader hit in a playoff series loss to the Detroit Red Wings, Lydman retired from professional ice hockey and accepted a TV analyst role to cover Finnish ice hockey.