Billy Griffiths, also known as William Griffiths, is an Australian historian and writer, known for his book Deep Time Dreaming: Uncovering Ancient Australia (2018). As of April 2020, he is a lecturer at Deakin University in Victoria, and Associate Investigator, ARC Centre of Excellence for Australian Biodiversity and Heritage (CABAH). Griffiths won the Ernest Scott Prize in 2019.