The Keyhole Castle is located in the East Hill neighborhood of Prince Albert, Saskatchewan, Canada.

It was built as the residence for Samuel McLeod, a former businessman, mayor of Prince Albert and federal politician.

Architect Erich Wohann of Minneapolis designed the building, with construction ending in 1913.

In 1975, the Keyhole Castle was designated a National Historic Site of Canada.

The Castle is also available as an event location, using either the ballroom, dining room, or, in the summer, the yard.