Gia Lewis-Smallwood (born April 1, 1979) is an American track and field athlete who specialises in the discus throw. She competed at the 2012 Summer Olympics in the discus throw event, finishing 15th in the qualifying round and not advancing to the final.

Lewis-Smallwood competed for the Illinois Fighting Illini track and field team, and was inducted into their hall of fame in 2020.

She holds the American record in an unofficial event: the indoor discus throw at 55.03 m.