Ruddock is an 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.
In 1892, William Burton and C. H. Ruddock founded the Ruddock Cypress Company. They constructed a sawmill and a town to serve their business, the latter of which became Ruddock. In 1902, the sawmill burned down, though it was later rebuilt. By 1910, the town had a population of 700. In September 1915, the 1915 New Orleans Hurricane hit Ruddock, destroying the town and killing 58 residents in Ruddock and the nearby town of Frenier. Ruddock has since become overgrown by vegetation, and all that remains of the settlement is rotted wood from the buildings.