Gary Wayne Hall Sr. (born August 7, 1951) is an American former competitive swimmer, three-time Olympic medalist, and former world record-holder in five events.

Hall made it a point to vigorously exercise in the swimming pool after daily med school classes.

At the end of the Montreal Olympics, his fellow American athletes from all sports disciplines chose him to be the U.S. flagbearer in the closing ceremony.

In October 1999, he was placed on probation for three more years and was censured for unprofessional conduct, permanently prohibited from performing certain procedures, forced to take additional educational courses, and pay a penalty of $15,000.

[6] A 1998 article from the Phoenix New Times indicated that Hall had 121 complaints lodged against him to the Arizona Medical Board since he began practicing in 1982.

"[9] Later on, he also became a local celebrity in Phoenix, as an ophthalmologist – appearing in his office's television ads and billboard campaigns.

Gary Hall Sr. currently lives in San Diego and operates The Race Club swimming camps.

[11] Hall's nephew is Chief petty officer Charles Keating IV, a Navy SEAL, who was killed at age 31 in combat with ISIS in Iraq in 2016.