J/Boats is an American boat builder based in Newport, Rhode Island and founded by Rod Johnstone in 1977. The company specializes in the design and manufacture of fiberglass sailboats. The company's model names all start with "J/" and then the design's length overall (LOA), in feet (such as the J/24), or beginning in 1994 in decimeters , or starting 2021 in meters . All J/Boat designs are monohull, sloop-rigged keelboats constructed of cored sandwich fiberglass. The current product line consists of eight models, ranging from the J/70 to the , ranging in length from 22.75 to 40 ft (6.9 to 12.2 m). A new 9 meter model has been announced for 2021. Past models have ranged from 22.5 to 64.5 ft (6.9 to 19.7 m), from the J/22 to the .