Mark O'Connor (born 19 March 1945) is an Australian poet, writer, and environmental activist.
He has published several books of poetry on regions of Australia such as the Great Barrier Reef and the Blue Mountains, often collaborating with renowned nature photographers.
He has also written two books on the issue of overpopulation, This Tired Brown Land (1998) and, more recently, Overloading Australia (2008, co-written by William J.