Cannabis is the most widely used illegal drug in Australia, with 2.5 million people in 2022–2023 having used it in the previous 12 months. Between 2013–14 and 2021–22, 221,000 clients received treatment for their cannabis use from publicly-funded drug treatment agencies. This report draws together data from multiple sources to describe trends in cannabis availability, use and treatment in Australia, including the characteristics of people who use or receive treatment for cannabis.