Auburn announced Doughty's signing on Tuesday. The 6-foot-4, 187-pounder from Philadelphia will have two years of eligibility remaining after redshirting next season.
Doughty played in 35 games and started 15 as a redshirt freshman at VCU. He averaged 9.0 points, 3.6 rebounds and 2.1 assists.
Doughty's scoring average was the highest for a VCU freshman since Shawn Hampton in 1998-99.
VCU lost to Saint Mary's in the first round of the NCAA tournament.
Auburn coach Bruce Pearl says Doughty can play several positions.
Doughty had a career-high 23 points with nine assists and seven rebounds at Duquesne.