William Robert Casey was an Irish sportsperson. He played Gaelic football with his local club Dingle and later Lispole and was a member of the Kerry senior inter-county team from 1938 until 1949. His nephew Brian Mullins played with Dublin in the 1970s and 1980s winning 4 All Ireland titles. Both his sons Gearóid, Gabriel and Riobard played with Kerry at all levels.