Jan Heyen Oltmanns (born November 6, 1956 in Esens) is a German Protestant clergyman and sailor deacon. He studied youth work at the Protestant University of Applied Sciences for Social Education and trained as a Deacon at the Rauhen House.
At the Deutsche Seemannsmission Hamburg-Harburg he was responsible for the development of the International Sailor Club Duckdalben. In cooperation with Anke Wibel he has been leading this sailor club since 1986. Today 938,000 guests from 181 countries around the world have visited the club.