John Rock

John Rock may refer to:
 * John Rock (abolitionist) (1825–1866), American abolitionist
 * John Rock (nurseryman) (1836-1904), owner of the California Nursery Company
 * John Rock (physician) (1890–1984), co-inventor of the birth control pill
 * John Rock, an alias of Danish singer Jon Nørgaard (born 1985)
 * Johns Rock, a hazard to shipping in Danish Waters