Janneke Louisa-Muller (born 1965) is a Dutch civil servant and former politician. From 12 May 2012 to 1 January 2013 she was Party Chairwoman of the ChristianUnion (ChristenUnie). She succeeded Peter Blokhuis and was succeeded by . Furthermore, she is town clerk of Wijk bij Duurstede. Louisa studied social and economic geography at the University of Groningen. She is married, lives in Cothen, and is an Evangelical.