On February 23, 2012, Carter was traded to the Los Angeles Kings in exchange for Jack Johnson and a conditional first-round pick, reuniting him with former Flyer and close friend Mike Richards.

On June 11, 2012, Carter scored the second of three unanswered goals on a five-minute power play in Game 6 of the 2012 Stanley Cup Finals against the New Jersey Devils.
His goal proved to be the Cup-winning goal.
He would finish the 2012 playoffs with eight goals and five assists.

During the lockout-shortened 2012–13 season, Carter scored 26 goals along with seven assists, playing in all 48 regular season games.

In the first round of the 2014 playoffs, the Kings rallied back from a 3–0 series deficit against the San Jose Sharks to win four-straight and take the series in seven games.
This made Carter one of the first and only two players (the other being his teammate Mike Richards) in history to be a part of two teams who achieved such a feat (Philadelphia Flyers in 2010, Los Angeles Kings in 2014; though Carter missed the Flyers' series in 2010 due to injury).
When the Kings beat the New York Rangers in 5 games in the 2014 Stanley Cup Finals, Carter and Drew Doughty became the seventh and eighth NHL players to win both an Olympic hockey gold medal and the Stanley Cup in the same year.

Early in the 2014–15 season, Carter was named the NHL's First Star of the Week for October 20–26 after scoring two goals and four assists in just two games.
This helped the reigning Stanley Cup champion Kings maintain a perfect 6–0 record during their season-opening homestand.
On February 15, 2015, Carter passed the 500 career NHL point mark with a three-assist performance against the Calgary Flames in a 5–3 victory for the Kings.
Carter played a majority of the season with Tanner Pearson and Tyler Toffoli, with the line being dubbed "That '70s Line" since all three had jersey numbers in the 70s.
 (Pearson #70, Carter #77, Toffoli #73)
On February 23, 2012, Carter was traded to the Los Angeles Kings in exchange for Jack Johnson and a conditional first-round pick, reuniting him with former Flyer and close friend Mike Richards.
On June 11, 2012, Carter scored the second of three unanswered goals on a five-minute power play in Game 6 of the 2012 Stanley Cup Finals against the New Jersey Devils. His goal proved to be the Cup-winning goal. He would finish the 2012 playoffs with eight goals and five assists.
During the lockout-shortened 2012–13 season, Carter scored 26 goals along with seven assists, playing in all 48 regular season games.
In the first round of the 2014 playoffs, the Kings rallied back from a 3–0 series deficit against the San Jose Sharks to win four-straight and take the series in seven games. This made Carter one of the first and only two players (the other being his teammate Mike Richards) in history to be a part of two teams who achieved such a feat (Philadelphia Flyers in 2010, Los Angeles Kings in 2014; though Carter missed the Flyers' series in 2010 due to injury). When the Kings beat the New York Rangers in 5 games in the 2014 Stanley Cup Finals, Carter and Drew Doughty became the seventh and eighth NHL players to win both an Olympic hockey gold medal and the Stanley Cup in the same year.
Early in the 2014–15 season, Carter was named the NHL's First Star of the Week for October 20–26 after scoring two goals and four assists in just two games. This helped the reigning Stanley Cup champion Kings maintain a perfect 6–0 record during their season-opening homestand. On February 15, 2015, Carter passed the 500 career NHL point mark with a three-assist performance against the Calgary Flames in a 5–3 victory for the Kings. Carter played a majority of the season with Tanner Pearson and Tyler Toffoli, with the line being dubbed "That '70s Line" since all three had jersey numbers in the 70s.  (Pearson #70, Carter #77, Toffoli #73)
Jeff Carter