Mullum Mullum Creek is a creek in the outer eastern suburbs of Melbourne, Victoria, Australia. It is the main watercourse of the Mullum Mullum Valley, a tributary of the Yarra River and Yarra Valley. For tens of thousands of years it was used as a food and tool source sustainably by the Wurundjeri people, Indigenous Australians of the Kulin nation, who spoke variations of the Woiwurrung language group.