In 2017-18, he captained the Avalanche to a 47-point turnaround, tied for the fourth highest in NHL history, while in 2013-14, he helped lead the Avs to a record-tying 52 wins and the franchise's first division title since 2002-03.
Internationally, Landeskog represented Sweden at the 2014 Olympics, the 2016 World Cup of Hockey, four IIHF World Championships (2012, 2013, 2017, 2019), the 2011 IIHF World Junior Championship and the 2009 IIHF Under-18 World Championship. He won a gold medal at the 2013 and 2017 IIHF World Championship and helped his country to the silver medal at the 2014 Winter Olympics.
Prior to turning pro, Landeskog played two seasons with the Kitchener Rangers of the Ontario Hockey League. He captained the Rangers in 2010-11, becoming the first European captain in the 48-year history of the franchise. He was also the youngest player in 30 years to be named captain of the Rangers when he assumed the role at the age of 17 on Oct. 24, 2010. Despite an ankle injury shortening his 2010-11 season to 53 games, Landeskog led Kitchener with 36 goals and finished third on the team with 66 points.
Landeskog was named to the OHL All-Rookie Team in 2009-10 after finishing third among league rookies with 46 points (24g/22a) in 61 games with Kitchener. Before coming to North America, Landeskog debuted in the Swedish Elite League with Djurgarden at 16 years and 90 days in 2008-09, making him the youngest player in the club's history.
Off the ice, Landeskog was Colorado's nominee for the King Clancy Memorial Trophy (leadership and humanitarian contribution) for six straight seasons from 2014-15 to 2019-20. He serves as a group ambassador for "Friends," a global anti-bullying effort based in Stockholm. He became the face of unique initiative when he participated in the You Can Play Project, which featured a video of Landeskog that the Colorado High School Activities Association used as the kickoff for a statewide effort that puts diversity and inclusion messaging in every locker room and student activity in Colorado. His many charitable efforts include joining the NHL and Avalanche in hosting a sled hockey exhibition match between the Warrior Avs (composed of military veterans) and the 2015 national champion Colorado Avalanche sled hockey team at Coors Field on Feb. 28, 2016. He developed "#Landeskoging" T-shirts following the 2011-12 season in which proceeds of every shirt sold were donated to the Children's Hospital Colorado Foundation.