Jameer Lamar Nelson Sr.[1] (born February 9, 1982) is an American former professional basketball player who serves as general manager for the Delaware Blue Coats of the NBA G League.

He has also played for the Dallas Mavericks, Boston Celtics, Denver Nuggets, New Orleans Pelicans and Detroit Pistons.

Nelson and junior guard Delonte West formed what was largely considered the nation's best backcourt, helping the Hawks earn a #1 seed in the NCAA tournament.

Though many speculated he would be a top 10 pick, he fell to number 20, and the Magic were able to acquire both Nelson and Dwight Howard in the same draft.

As a rookie, Nelson served as the primary backup to the Magic's All-Star point guard Steve Francis.

[4] On February 22, 2006, the Magic dealt Francis to the New York Knicks, paving the way for Nelson to become the long-term starting point guard of Orlando.

[5] Nelson's play improved with the mid-season trade of Francis, finishing the season with averages of 14.6 points and 5 assists per game on 48.3% field goal shooting.

He averaged 14.3 points, 3 rebounds, and 3.3 assists per game during the NBA playoffs, however the Magic were ultimately swept by the top-seeded Detroit Pistons in the first round.

[11] Nelson and the Magic again surged into the playoffs with their third straight Southeast Division title, sweeping the Charlotte Bobcats and Atlanta Hawks before falling to the Boston Celtics in six games in the Eastern Conference Finals.

On March 18, 2011, Nelson made a game winning buzzer beater against the Denver Nuggets to secure an 85–82 victory for Orlando.

[14] Nelson and Dwight Howard, who were close friends since their rookie seasons, were on opposite sides of a trade that sent Rashard Lewis to Washington in exchange for Gilbert Arenas (Nelson considered Lewis one of the team's leaders while Howard reportedly pushed management into making the trade).

[15] Their relationship was further strained when Howard publicly stated his desire to play with a superstar point guard like Deron Williams or Chris Paul,[16] and was reportedly the driving force behind the firing of coach Stan Van Gundy.

In his second game with Boston, Nelson returned to Orlando for the first time since leaving for Dallas as a free agent.

[29] Seven days later, he was traded to the Detroit Pistons in exchange for Willie Reed and future second-round draft considerations.

On November 11, 2020, the Delaware Blue Coats of the NBA G League named Nelson as the assistant general manager.