Placentia

Placentia may refer to:


 * Palace of Placentia, an English royal palace
 * Placentia, Italy, a Roman city known today as Piacenza
 * Placentia, Newfoundland and Labrador, Canada
 * Placentia Bay, body of water
 * Placentia, California, United States
 * Placentia station, proposed train station in Placentia
 * Battle of Placentia (disambiguation)
 * Placentia Bay
 * HMS Placentia, the name of two ships of the Royal Navy