Bertha "Puck" Brouwer (since 1953 van Duyne; 29 October 1930 – 6 October 2006) was a Dutch sprinter.Brouwer accomplished her first international notable result in 1950, when she won the silver medal at the European Championships, being part of the 4×100 metres relay team alongside Fanny Blankers-Koen. She competed at the 1952 Summer Olympics in the 100 m, 200 m and 4×100 m relay, and won a silver medal in the 200 m.