2008-09: Marc Cantin appeared in 62 games with the Belleville Bulls in his second full OHL season. He scored 1 goal with 14 assists and was +35 with 51 PMs on a Bulls team that won the OHL's East Division and advanced to the semifinals of the OHL Playoffs. In 17 playoff games, he had 2 assists and was +5 with 26 PMs. Cantin was ranked 185th in Central Scouting's final rankings of North American skaters but was not drafted in the 2009 NHL Draft.
2009-10: Cantin began the year with Belleville before being part of a blockbuster, mid-season deal that sent him to the eventual OHL and Memorial Cup-champion Windsor Spitfires. In 33 games with a young Bulls squad that would eventually finish with the OHL's second-worst record, Cantin scored 1 goal with 7 assists and was -15 with 63 PMs. In 24 games with Windsor, he scored 2 goals, both on the power play, and had 5 assists and was +9 with 41 PMs. Cantin scored 3 goals with 3 assists and was +13 with 21 PMs in 19 OHL playoff games. In 4 games at the Memorial Cup tournament, Cantin scored 1 goal with 1 assist and had 2 PMs. Cantin attended Boston's development camp following the season but was not signed to a contract.
2010-11: Cantin played for Mississauga St. Michael's (OHL) in his final season of junior hockey after an August trade with Windsor. Mississauga dominated the regular season winning 53 games and advanced to the playoff finals before falling to Owen Sound. The fact that Cantin's +43 plus/minus was only sixth-best (and third best amongst defensemen) on the Majors is a testament to the team's regular season dominance. In 61 games for St. Mike's Cantin scored 10 goals with 31 assists and had 78 PMs. In 20 OHL playoff games, Cantin had six assists and was +11 with 18 PMs. In the Memorial Cup, which Mississauga hosted, Cantin had two assists in five games as the Majors advanced to the championship game but were defeated by QMJHL champ Saint John.
2011-12: Cantin split his first pro season between the AHL and ECHL and was traded from Boston to the Islanders organization along with prospect Yannick Riendeau for veterans Brian Rolston and Mike Mottau in a deadline deal at the end of February. Cantin played 19 games for the Providence Bruins and two with Islanders' affiliate Bridgeport. He was minus-nine in his 21 AHL games and had no points with 26 penalty minutes. In 25 ECHL games with the Reading Royals he had 2 goals with 7 assists and was minus-three with 34 penalty minutes. In the Royals' first round playoff series with Elmira he was minus-five with 2 assists in five games.
2012-13: Marc Cantin skated in 22 AHL games with the Islanders' AHL affiliate in Bridgeport in his second pro season and spent time with the ECHL's Las Vegas Wranglers in March. Cantin was frequently a healthy scratch during the NHL lockout and also missed time after suffering a head injury on a hit by Connecticut's Dylan McIlrath in January. He had 1 assist and was +1 with 48 penalty minutes with Bridgeport. The Sound Tigers missed the AHL playoffs after finishing third in the Northeast Division. Cantin had 1 assist and was +3 with 16 penalty minutes in six games with Las Vegas.
Undrafted defenseman Mark Cantin is a rugged, defensive defenseman with a winning pedigree. A good skater, not explosive-fast, but very mobile, with good footwork and power. He’s shown significant gains in his ability to move the puck, but his real strength lies in his defensive work, where he prides himself on shutting down the opposition’s best and does it with real zest, punishing them and playing an in-your-face style.
Cantin has returned to the AHL's Bridgeport Sound Tigers for the 2013-14 season.