Kopitar signed an entry-level contract with the Kings on 7 September 2005, but returned to play in Sweden for another season.
The next year, 2006, he accepted an invitation to Los Angeles' rookie camp.
He made his NHL debut on 6 October 2006, against the Anaheim Ducks and scored two goals in the game.
In January 2007, he was named to the NHL YoungStars Game, an event included at the All-Star Game festivities; Kopitar recorded two goals and three assists.
Kopitar completed his first NHL season third among rookies in scoring, behind Evgeni Malkin and Paul Šťastný, with 20 goals and 41 assists for 61 points.
It marked the fifth-highest point total by a Kings rookie, and the highest since Luc Robitaille in 1986–87.
He finished fourth in voting for the Calder Memorial Trophy as rookie of the year.
Kopitar was awarded the Mark Bavis Memorial Award as the best first-year member of the Kings and was also named the Kings' Most Popular Player.

The following season, 2007–08, Kopitar was selected to represent the Western Conference at the 56th NHL All-Star Game in Atlanta, his first all-star game appearance.
He was the youngest player in the game, nearly two years younger than the second-youngest player, Paul Stastny (Sidney Crosby was younger, but had to withdraw prior to the game due to injury).
Kopitar finished the regular season with 32 goals and 45 assists for 77 points; he led the Kings in assists and points and was second in goals.
Kopitar won the Bill Libby Memorial Award as the most valuable player on the Kings.

Early in the 2008–09 season, on 11 October 2008, Kopitar signed a seven-year contract extension with the Kings worth $47.6 million.
The contract would keep Kopitar with the team until the conclusion of the 2015–16 season.
He finished the season with 66 points in 82 games, leading the Kings in both assists and points, while again finishing second in goals scored.
The following season, Kopitar scored his first career NHL hat-trick (3 goals in one game) on 22 October 2009 against the Dallas Stars.
He finished the 2009–10 season with a career-high 34 goals and 81 points.
For the second time in his career, Kopitar won the Bill Libby Memorial Award as the Kings' most valuable player, and led the team in scoring for the third-straight year.
Kopitar made his Stanley Cup playoff debut that season, as the Kings qualified for the post-season for the first time since 2002.
The Kings lost in the Western Conference Quarterfinals to the Vancouver Canucks, and Kopitar finished tied for third on the team with five points in six games.

The 2010–11 season saw Kopitar play in his 325th consecutive NHL game, which set a new Kings team record, passing Marcel Dionne on 15 March 2011.
However eleven days later, Kopitar's season and ironman streak came to an abrupt end at 330 games after he suffered a broken ankle.
Despite the injury setback, Kopitar led the team in scoring for the fourth straight season with 73 points, and was named the team's most valuable player for the second time.
In the 2011–12 season, Kopitar led the Kings in scoring with 76 points, including a career-best 51 assists.
The Kings won the Stanley Cup as playoff champions, their first title in team history.
Kopitar finished tied with Kings captain Dustin Brown to lead the team in playoff scoring, with each having 20 points from 20 games played.
Kopitar became the first Slovenian-born player to win the Stanley Cup.
In recognition of this, Kopitar was named as the 2012 Slovenian male Athlete of the Year.

The 2012–13 NHL season was delayed due to the NHL lockout, so Kopitar joined his younger brother Gašper on Mora IK of the Swedish second-tier league HockeyAllsvenskan, signing a contract with the team for the 2012–13 season.
He played 31 games for Mora, scoring 34 points, before the NHL lockout ended in January 2013.
A shortened, 48-game NHL season commenced, Kopitar recorded 42 points in 47 games to once again lead the Kings in scoring, and was named the team's best defensive player.

The 2013–14 season saw Kopitar lead the team in scoring for the seventh consecutive seaso
Kopitar signed an entry-level contract with the Kings on 7 September 2005, but returned to play in Sweden for another season. The next year, 2006, he accepted an invitation to Los Angeles' rookie camp. He made his NHL debut on 6 October 2006, against the Anaheim Ducks and scored two goals in the game. In January 2007, he was named to the NHL YoungStars Game, an event included at the All-Star Game festivities; Kopitar recorded two goals and three assists. Kopitar completed his first NHL season third among rookies in scoring, behind Evgeni Malkin and Paul Šťastný, with 20 goals and 41 assists for 61 points. It marked the fifth-highest point total by a Kings rookie, and the highest since Luc Robitaille in 1986–87. He finished fourth in voting for the Calder Memorial Trophy as rookie of the year. Kopitar was awarded the Mark Bavis Memorial Award as the best first-year member of the Kings and was also named the Kings' Most Popular Player.
The following season, 2007–08, Kopitar was selected to represent the Western Conference at the 56th NHL All-Star Game in Atlanta, his first all-star game appearance. He was the youngest player in the game, nearly two years younger than the second-youngest player, Paul Stastny (Sidney Crosby was younger, but had to withdraw prior to the game due to injury). Kopitar finished the regular season with 32 goals and 45 assists for 77 points; he led the Kings in assists and points and was second in goals. Kopitar won the Bill Libby Memorial Award as the most valuable player on the Kings.
Early in the 2008–09 season, on 11 October 2008, Kopitar signed a seven-year contract extension with the Kings worth $47.6 million. The contract would keep Kopitar with the team until the conclusion of the 2015–16 season. He finished the season with 66 points in 82 games, leading the Kings in both assists and points, while again finishing second in goals scored. The following season, Kopitar scored his first career NHL hat-trick (3 goals in one game) on 22 October 2009 against the Dallas Stars. He finished the 2009–10 season with a career-high 34 goals and 81 points. For the second time in his career, Kopitar won the Bill Libby Memorial Award as the Kings' most valuable player, and led the team in scoring for the third-straight year. Kopitar made his Stanley Cup playoff debut that season, as the Kings qualified for the post-season for the first time since 2002. The Kings lost in the Western Conference Quarterfinals to the Vancouver Canucks, and Kopitar finished tied for third on the team with five points in six games.
The 2010–11 season saw Kopitar play in his 325th consecutive NHL game, which set a new Kings team record, passing Marcel Dionne on 15 March 2011. However eleven days later, Kopitar's season and ironman streak came to an abrupt end at 330 games after he suffered a broken ankle. Despite the injury setback, Kopitar led the team in scoring for the fourth straight season with 73 points, and was named the team's most valuable player for the second time. In the 2011–12 season, Kopitar led the Kings in scoring with 76 points, including a career-best 51 assists. The Kings won the Stanley Cup as playoff champions, their first title in team history. Kopitar finished tied with Kings captain Dustin Brown to lead the team in playoff scoring, with each having 20 points from 20 games played. Kopitar became the first Slovenian-born player to win the Stanley Cup. In recognition of this, Kopitar was named as the 2012 Slovenian male Athlete of the Year.
The 2012–13 NHL season was delayed due to the NHL lockout, so Kopitar joined his younger brother Gašper on Mora IK of the Swedish second-tier league HockeyAllsvenskan, signing a contract with the team for the 2012–13 season. He played 31 games for Mora, scoring 34 points, before the NHL lockout ended in January 2013. A shortened, 48-game NHL season commenced, Kopitar recorded 42 points in 47 games to once again lead the Kings in scoring, and was named the team's best defensive player.
The 2013–14 season saw Kopitar lead the team in scoring for the seventh consecutive seaso
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