In this article, I chronicle the recent history of efforts to broaden school choice in the Commonwealth of Australia and the opposition to these efforts put forth by Australia's largest teacher union, the Australian Education Union (AEU). Evidence is presented on the positive effects that flow from the public funding of nongovernment schools and of the perception held by principals that less external regulation improves school functions. In spite of this, the Union continues to oppose choice efforts. I conclude that, at least in Australia, the influence of the AEU has placed impediments in the way of increased school choice and autonomy. Readers in other countries may draw their own conclusions from these observations in Australia. [For the response to this article, "The Australian Education Union's Response to Kevin Donnelly's 'The Australian Education Union: A History of Opposing School Choice and School Autonomy Down-Under,'" see EJ1082277.]