Grandfather Art Whisnant played basketball at South Carolina and was a three-time all-Atlantic Coast Conference selection in the early 1960s.

Younger brother and caddie Austin played guard for the Charleston Southern University basketball team.

Launched the Dustin Johnson Foundation in 2010 for the purpose of supporting various youth initiatives with the primary focus of promoting and supporting youth and college golf programs.

Formed the Dustin Johnson Golf School, located at TPC of Myrtle Beach, with former Coastal Carolina University coach Allen Terrell, who recruited Johnson in college and remains his coach.