Placentia may refer to: Palace of Placentia, an English royal palace Placentia, California, United States Placentia, Italy, a Roman city known today as Piacenza Placentia, Newfoundland and Labrador, Canada Battle of Placentia (disambiguation) Placentia Bay , the name of two ships of the Royal Navy See also Placencia, Belize Plasencia, Extremadura, Spain Plentzia, Basque Country, Spain Piacenza (disambiguation) Plaisance (disambiguation), a French word Not to be confused with Placenta