Hälleforsnäs is a locality in Flen Municipality, Södermanland County, Sweden with approximately 2000 inhabitants in 2020.

This village was an industrial center until the foundry it was built around ceased operations after 350 years in the early 1990s.

The foundry switched from producing military products to civilian radiators and stoves at the beginning of the 20th century.

In the 1960s, when the foundry was at its peak, more than a thousand people worked there, as well as a few hundred in related occupations nearby.

Today, the actual foundry serves as a center for local artists, and Hälleforsnäs has become the cultural heart of Sörmland.