Captain Sir John Rupert Hunt Thouron KBE (10 May 1907 – 6 February 2007) was a British-American horticulturist, landscape gardener, and philanthropist.

Thouron was later seconded to the Special Operations Executive (SOE) at Bletchley Park, tasked with sending British and European personnel into Nazi-occupied countries to create resistance groups.

Thouron was inspired by the camaraderie between British and American troops fighting together in the war and wanted to continue the Special Relationship in peacetime.

[2][4] As a landscaper, Thouron nurtured gardens with almost 2,000 varieties of plants at Doe Run, his 220-acre estate and horse farm in Coatesville, Pennsylvania.

He was the first to cultivate a clear yellow lily (described as "one of the holy grails of the plant world"), which grows in a vase shape.