Nadia Anita Louise Nall, also known by her married name Anita Nall-Richesson, is an American former competition swimmer, Olympic champion, and former world record-holder. As a 16-year-old at the 1992 Summer Olympics, Nall won a gold medal in the women's 4×100-meter medley relay, a silver medal in the women's 100-meter breaststroke, and a bronze in the women's 200-meter breaststroke. Earlier that year, she broke the world record in the women's 200-meter breaststroke, as a 15-year-old at the U.S. Olympic trials.

While competing for a place on the U.S. swimming team for the 1992 Summer Olympics, Nall set a then-world record at the Olympic trials. Murray Stephens, her coach at the North Baltimore Aquatic Club, said of Nall after she broke the world record, "Physically she's a strong girl. Competitively, she's probably 25. She knows how to compete and she likes to compete. She likes to swim aggressively."

Nall's specialty at the 1992 Summer Olympics was the breaststroke. She made the U.S. Olympic team that year as a 15-year-old, the youngest swimmer on the U.S. Olympics women's team. The head coach of Northwestern University's women's swim team was quoted just prior to the Olympics that year as saying, "Anita has technically a perfect breaststroke. The breaststroke is very much a lower body stroke where you really use your legs. She uses her body perfectly and gets the most out of her stroke technique-wise". Nall went on to swim the breaststroke leg of the 4 × 100 m medley relay at the 1992 Summer Olympics in Barcelona, winning the team gold medal and becoming the youngest American gold medalist in swimming since 1976.

The next year, Nall's swimming faltered, attributed to chronic fatigue syndrome and blood pressure abnormalities. She retired from swimming in 2000, after failing to qualify for the 2000 U.S. Olympics team.

In 2008, Nall was inducted as an Honor Swimmer by the International Swimming Hall of Fame, which cited her swim medals won at such a young age and her technically perfect breaststroke.

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