Donald Arvid "Don" Nelson (born May 15, 1940) is an American former NBA player and head coach. He coached the Milwaukee Bucks, the New York Knicks, the Dallas Mavericks, and the Golden State Warriors.

An innovator, Nelson is credited with, among other things, pioneering the concept of the point forward, a tactic which is frequently employed by teams at every level today. His unique brand of basketball is often referred to as Nellie Ball. He was named one of the Top 10 coaches in NBA history. On April 7, 2010, he passed Lenny Wilkens for first place on the all-time NBA wins list with 1,333 wins. His all-time record is 1,335–1,063 (.557).

After a very successful high school career at Rock Island High School, Nelson played for the University of Iowa as a two-time All-American averaging 21.1 points and 10.5 rebounds a game. He was drafted 19th overall by the Chicago Zephyrs of the NBA. He played for the Zephyrs one season, and was acquired by the Los Angeles Lakers in 1963. After two years with the Lakers, he was signed by the Boston Celtics.

In his first season with Boston, Nelson averaged 10.2 points and 5.4 rebounds, helping the Celtics to the 1966 NBA title as one of their role players. Four more championships with Boston followed in 1968, 1969, 1974, and 1976. In Game 7 of the 1969 NBA Finals, against his former team, the Lakers, Nelson converted one of the most famous shots in playoff history — a foul-line jumper which dropped through the basket after hitting the back rim and bouncing several feet straight up. The shot, taken with just over a minute to go in the game and the Celtics clinging to a 103–102 lead, helped secure Boston's 11th NBA title in 13 seasons.

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