Annie Treffers
Annie Treffers (born  1900s) was a Dutch competitive swimmer, diver and water polo player. She was a swimmer in the earliest era of women's competitive swimming during the early 20th-century. She was a member of swimming club "Rotterdamsche Dames Zwemclub" (RDZ) in Rotterdam and represented the Netherlands and her club internationally. At the 1922 Women's Olympiad she won the gold medal in the water polo competition and the two silver medals with the Dutch relay team.