Carter, 41, signed a one-year deal worth $2.4 million, ESPN reported.
The Hawks are in retooling mode with a younger roster that features lottery pick and point guard Trae Young, and are reportedly banking on Carter to be a leader on and off the court.
Carter appeared in 58 games with the Sacramento Kings last season, averaging 5.4 points and 2.6 rebounds in 18 minutes per game.
He won the Slam Dunk contest in 2000, capturing a gold medal that same year as part of the U.S. men's basketball team in Sydney, Australia.
Carter was scheduled to address the media Friday afternoon.
This story originally appeared on AmicoHoops.net