Dr Cian O'Neill is an Irish former Gaelic footballer who has since been a Gaelic games coach (physical trainer), selector and manager with various county teams. He has been attached to the Galway county football team, under Pádraic Joyce, since 2021. O'Neill trained the Tipperary county hurling team that won the 2010 All-Ireland Senior Hurling Championship. After involvement with the Mayo and Kerry county football teams, he served as manager of the Kildare county football team for several years.