George Patrick Leonard Walker FRS (2 March 1926 – 17 January 2005) was a British geologist who began his career studying mineralogy and later made significant contributions to volcanology.
He was the only child of Leonard Walker, an insurance salesman, and Evelyn Frances (nee McConkey), a nurse.
This work earned him an international reputation as a meticulous mineralogist, and provided the first evidence for how the crust grows at oceanic ridges.
In 1977, Walker was awarded a Captain James Cook Fellowship of the Royal Society of New Zealand, which he took up at the University of Auckland.
Although this began as a visiting position, in 1978 Walker resigned from Imperial College, and moved to New Zealand with his family.