Ruddock is a ghost town in St. John the Baptist Parish, Louisiana, United States. Ruddock was located on an isthmus between Lake Maurepas and Lake Pontchartrain, 10 miles (16 km) north-northeast of LaPlace. Although the town was destroyed by a hurricane in 1915, it is still signed as an exit on Interstate 55 and marked on Louisiana state highway maps, as of 2011.