Cassidy Possum (Stockman) Tjapaltjarri (1923 – 25 February 2006) was an Australian Aboriginal spokesman, a tribal elder and well known visual artist.
It is unclear exactly when he started painting, however, he was a regular painter during his many years as a pensioner at Mount Allan.
His traditional country covered a large tract of land (several thousand square miles) and included many important dreaming sites.
Cassidy's full brother was Clifford Possum Tjapaltjarri, one of the most famous of all "first generation" contemporary Indigenous Australian artists.
Cassidy was one of the first generation artists who painted important and powerful dreamings that preserved his culture.