Herman Bastiaan "Bas" Eenhoorn (born 14 September 1946) is a Dutch politician and management consultant.
A member of the People's Party for Freedom and Democracy (VVD), he was party chair from 1999 until 2003.
Eenhoorn served as Mayor of Schiermonnikoog (1976–1983), Voorburg (1983–1996), as well as Acting Mayor of Lansingerland (2007), Kaag en Braassem (2009–2010), Alphen aan den Rijn (2010–2012), Vlaardingen (2014) and Amstelveen (2017–2019).
He became well-known after giving press conferences in his function as acting mayor after the Alphen aan den Rijn shopping mall shooting on 9 April 2011.
He studied social and economic geography with a specialisation in public administration at the University of Groningen.