Segersön Nature Reserve is a nature reserve in Strängnäs Municipality, Södermanland County, Sweden.
Description The area has been protected since 2025 and is 179 hectares in size. The reserve includes the island of the same name and a few small islands around in Lake Mälaren and consists of deciduous forests and pastures. It is only accessible only by boat. The reserve features a four-kilometer hiking trail traversing varied landscapes of cattle-grazed pastures, swimming cliffs, and dense broadleaf forests. As an ecological sanctuary, the site supports over 75 red-listed species, including rare beetles in 300-year-old pollarded linden trees.
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