The queen says phantoms at their private Drottningholm Palace are "pretty friendly" in a documentary about to be aired today on public television channel SVT.
Silvia says smilingly "there are ghosts, many" before adding "you feel you get a little excited" when talking about them.
Asked whether she had experienced the ghosts herself, she replied "of course. But they are friendly."
Located on an island in Stockholm's archipelago, the royals' private residence was originally built in the late 16th century.