The Wagyl is the Noongar manifestation of the Rainbow Serpent in Australian Aboriginal mythology, from the culture based around the south-west of Western Australia. The Noongar describe the Wagyl as a snakelike Dreaming creature responsible for the creation of the Swan and Canning rivers and other waterways and landforms around present day Perth and the south-west of Western Australia.

The Noongar are Aboriginal Australian people who live in the south-west corner of Western Australia, from Geraldton on the west coast to Esperance on the south coast. There are 14 different groups in the Noongar cultural bloc: Amangu, Ballardong, Yued, Kaneang, Koreng, Mineng, Njakinjaki, Njunga, Pibelmen, Pindjarup, Wadandi, Whadjuk, Wiilman and Wudjari. The Noongar people refer to their land as Noongar boodja.