Donald J. Carter (July 5, 1933 – February 14, 2018) was an American investor and businessman who was a founding owner of the Dallas Mavericks of the National Basketball Association (NBA) and the Dallas Sidekicks of the Major Indoor Soccer League (MISL). At the time of his death he was a minority partner in the Mavericks and a familiar courtside presence at the team's home games, always wearing a cowboy hat.