Karlene Ann Maywald (born 26 May 1961) is an Australian National Party politician who represented the seat of Chaffey in the South Australian House of Assembly from October 1997 until March 2010. During her tenure, from 2004 until 2010, she was the Minister for the River Murray and Minister for Water Security in the Rann Labor government. She is currently the Chair of the National Water Commission and a Director of SA Water, as well as Managing Director of Maywald Consultants Pty Ltd.