Alphonso "Buck" Johnson Jr. (born January 3, 1964) is an American former professional basketball player.

Johnson, a 6'7" small forward, played seven seasons in the National Basketball Association (NBA) for the Houston Rockets and Washington Bullets.

He played for the Rockets from 1986 to 1992, and for the Washington Bullets during the 1992–93 season.

In his NBA career, Johnson played in 505 games, and scored a total of 4,617 points.

Johnson won a gold medal with Team USA's Under-19 junior national team, at the 1983 FIBA Under-19 World Cup.