Herman Bastiaan (Bas) Eenhoorn (born September 14, 1946 in Groningen) is a Dutch politician and former civil servant. He is a member of the People's Party for Freedom and Democracy (Volkspartij voor Vrijheid en Democratie). He currently serves as interim mayor of Vlaardingen. Previously he was mayor of Alphen Aan Den Rijn, Schiermonnikoog (1976–1983) and Voorburg (1983–1996) as well as acting mayor of Lansingerland (2007) and Kaag en Braassem (2009–2010).
Eenhoorn became well-known after giving press conferences in his function as acting mayor after the Alphen aan den Rijn shopping mall shooting on April 9, 2011.
Eenhoorn studied social and economic geography with a specialization in public administration at the University of Groningen.