Little Placentia Sound is a small natural bay (sound) located within Placentia Bay on the Avalon Peninsula of the island of Newfoundland, in the Canadian province of Newfoundland and Labrador.
During World War II the United States Navy built a naval base nearby at Argentia.
Coordinates: 47°18′23″N 53°55′34″W / 47.30639°N 53.92611°W