Jopie van Alphen (born 12 May 1940) is a retired Dutch backstroke swimmer. She was part of the 4 × 100 m medley relay team (with Rika Bruins, Atie Voorbij, Hetty Balkenende) that set a new world record on 17 July 1955 in Paris.
References
Historique : Records du Monde du 4x100 4 Nages Dames. French swimming federation (see also note in "Équipe de relais")