Hallwyl Museum (Swedish: Hallwylska museet) is a Swedish national museum housed in the historical Hallwyl House in central Stockholm located on 4, Hamngatan facing Berzelii Park.

The house once belonged to the Count and Countess von Hallwyl, but was donated to the Swedish state in 1920 to eventually become a museum.

While the exterior of the building and the court is historical in style — borrowing architectural elements from medieval prototypes and Renaissance Venice — it was utterly modern on its completion — including electricity, central heating, telephones, and bathrooms.

The countess collected her artworks during her worldwide journeys in order to found a museum, and, consequently, the palace was donated to the Swedish State in 1920, a decade before her death.

The museum features preserved rooms from the late Victorian period in Sweden giving a glimpse into the lifestyles of the nobility in Stockholm at the time.