Catharina Johanna "Toos" Beumer (born 5 July 1947 in Koog aan de Zaan) is a Dutch swimmer. She won the bronze medal in the 4×100 metres freestyle relay at the 1964 Summer Olympics in Tokyo. Her teammates in that race, clocked in 4:12.0, were Pauline van der Wildt, Erica Terpstra and Winnie van Weerdenburg. Four years later, Beumer also participated in the 1968 Summer Olympics in Mexico City, in the 100m freestyle, but she didn't qualify for the semi-finals.

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