Maria Emma Hulga Lenk (January 15, 1915 – April 16, 2007) was a Brazilian swimmer, the first South American woman to participate in the Summer Olympic Games, in 1932 (Los Angeles).

Lenk's account of the event was that at the time she subscribed to a German specialized magazine that ran a story on David Armbruster's and Jack Sieg's work in developing "a new way of swimming the Breaststroke".

Lenk's goal of winning an Olympic medal was cut short when World War II caused the cancellation of the Games of 1940 and 1944, which would have corresponded to her peak in competitive swimming.

On April 16, 2007, she was training in the Clube de Regatas do Flamengo's swimming pool when her blood pressure dropped and she suffered a sudden respiratory arrest.

She was taken to Copa D'Or Hospital, in Copacabana, but medical personnel couldn't revive her and she died of cardiac arrest, aged 92.