Gary Hall Jr
- Category : 1974-births
- Type : GP
- Profile : 5/1 - Heretical / Investigator
- Definition : Single
- Incarnation Cross : LAX Healing 2
American former competition swimmer who represented the United States at the 1996, 2000, and 2004 Olympics and won ten Olympic medals (five gold, three silver, two bronze). He is a former world record-holder in two relay events. Hall is well known for his "pro-wrestling like" antics before a competition; frequently strutting onto the pool deck in boxing shorts and robe, shadow boxing and flexing for the audience.
His father, Gary Hall, Sr., also competed in three Olympics as a swimmer (1968, 1972 and 1976). His maternal uncle, Charles Keating III, swam in the 1976 Olympics, and his maternal grandfather, Charles Keating Jr., was a national swimming champion in the 1940s.