Saint Bernard is an unincorporated community in St. Bernard Parish, Louisiana, United States. The community is located on Louisiana State Highway 300, east of the Mississippi River and 8 miles southeast of Chalmette. Saint Bernard is home to four sites on the National Register of Historic Places: the Dr. Louis A. Ducros House, the Kenilworth Plantation House, Magnolia Mound, and the Sebastopol Plantation House.