Johannes "Jan" Jiskoot (born 3 March 1940 in Dordrecht) is a retired Dutch swimmer who won two medals in medley events at the 1962 European Aquatics Championships.[1] He also participated in the 1960 and 1964 Summer Olympics and was sixth in the 400 m medley.[2] He started as a backstroke swimmer, but then leaned more to butterfly and medley. On 18 September 1962 he set the European 100 m batterfly record at 0:59:50, becoming the first European to swim 100 m butterfly within one minute. Between 1960 and 1966 he was 14 times national champion and set more than 20 national records in various backstroke, butterfly and medley events.[3]