Joshua Gwillen Doan (1811 – February 6, 1839) was a farmer and tanner who participated in the Upper Canada Rebellion of 1837.
He was born in the Sugar Loaf area (now within Port Colborne) of the Niagara District in 1811 to a family of Quakers who had left Pennsylvania before the start of the War of 1812.
On December 13, they were dispersed by loyalist troops led by Colonel Allan MacNab near Brantford.
In December 1838, he was part of a raid launched on Windsor by a group of refugees from the Rebellion known as Patriots.
(See Patriot War) In January 1839, he was tried at London, Ontario, found guilty of treason and sentenced to death.