On 11 June 2012, Hopper was named a Companion of the Order of Australia for "eminent service as a global science leader in the field of plant conservation biology, particularly in the delivery of world class research programs contributing to the conservation of endangered species and ecosystems."
In June 2012, Hopper received the honor of becoming a Companion of the Order of Australia for his significant contributions to plant conservation biology. His work has been instrumental in developing world-class research programs that have helped protect endangered species and ecosystems.