Hässelbyholm is a Renaissance style manor house in Strängnäs Municipality, Södermanland County, Sweden.

Hässelbyholm was the result of the merger of the two estates Hässelby and Ekeby in Södermanland.

Werner Brunkow Ekeby sold the property in 1279 to the Bishop of Strängnäs.

In 1747, she made Hässelbyholm a Fideicommissum for his granddaughter Countess Eva Charlotta Bielke and her heirs.

[1] This article is fully or partially based on material from Nordisk familjebok, Hässelbyholm, 1904–1926.