Fritze Wulff Carstensen (née Nathansen, 18 July 1925 – 5 August 2005) was a Danish freestyle swimmer.

She won two European titles in 1947 and was part of the Danish 4×100 m relay team that won a silver medal at the 1948 Summer Olympics, where she placed seventh-eighth in her individual 100 m and 400 m events.

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