Louise Elizabeth Markus (born 6 September 1958) is a former Australian politician who served as a member of the Australian House of Representatives, initially elected to represent the seat of Greenway in western Sydney for the Liberal Party of Australia at the 2004 federal election. Following an unfavourable redistribution in 2010, she moved to the seat of Macquarie. She lost the 2016 federal election to Labor's Susan Templeman.