William Foster Hardin (born January 13, 1942, in Shreveport, Louisiana) is an American retired track and field athlete.
He represented the United States at the 1964 Olympics in the 400 meters hurdles.
Like his father, he ran for the LSU Tigers and won the NCAA championship in the 400 hurdles 30 years after his father repeated in the 440 yard dash.
He was also the USA champion at 400 meters hurdles that year, duplicating a championship his father won three times.
Video on YouTube @:40 In the Olympics, he was the fastest of the first round, but finished in a non-qualifying sixth in his semi-final.